This one might require more machining, but I think it will be safer and much cleaner looking when installed. I took pictures of the final results, but didn't think to take "progress" pics and it was too dark to get pics of them in the car. I'll try to explain the steps as best as I can.
Also, I don't know if this will work for any seats other than the Tenzo Rally's. I'd suggest putting the stock brackets on the bottom of the seat and seeing if you have about an inch of room on either side. If you do, you're golden.
First, get yourself some 1" square tubing from Home Depot or Lowes. A 6ft section ran me $20. While you're there, pick up a bunch of grade 8 bolts. I went in looking for the largest bolts that would fit on a 13mm socket. Why 13mm? because you can drill a 3/4" hole and a 13mm socket will fit with just a little bit of room to maneuver.
Now, the key for this is getting a stepped drill bit. I got mine from
Harbor Freight for $9. If you want to get it at Lowes, expect to pay about $45.
First, cut your square tubing to fit the length of your seat. I did the length of the seat bracket, but now I wish I had gone a little longer. It would have allowed more versatility in mounting the actual seat and how far back it could sit.
Mark your holes for the bolts on the bottom of the Tenzo's. Drill with the stepped bit (make sure you center the bit). If you do it properly, you can drill one time and go all the way down to the 3/4" section. This will leave the top hole at 3/4", and the bottom one at 3/8" or 7/16" (can't remember off the top of my head).
Bolt the tubes to your seats to ensure they were drilled properly and that the holes line up with the seat bolts.
Now it's time to fit the seat bracket.
The first thing you'll have to do is "relocate" your seat belt bolt. I cut mine off completely since I'll be running 4 pt. harnesses, and therefore I will leave you to figure out what you want to do with your seat belts. There are two rivets holding in the piece that the seat belt receiver bolts to. Grind those off. You should be able to slide/hammer off the seat belt piece attached to the slider.
Next, it's time to position the OEM sliders on the seat. Determine where you would like to have them sitting, and mark your holes. Chances are, you won't be able to use any existing holes for this. I have 6 holes in the OEM sliders, and only 1 was originally there. Even then, I still had to drill it out. No problem though. Just make new ones!
A few things to take into consideration.
*Make sure you don't "overlap" the holes for the bolts that go to the seat's. This makes it difficult to tighten the bolts. I learned this the hard way (see the picture below).
*The further forward you place your bracket, the further you will be able to adjust your seat backwards. This is handy information for those of you with long legs.
*I suggest drilling into the square tubing first. It's easier/cheaper to replace the tube if you mess up, plus drilling a hole in the center of the tube does not necessarily mean it will be centered on the bracket. Centering the hole on the tube is important because you'll need to get that socket in there.
Mark where you want your bolts to go, and drill the tube. Keep in mind which side is which. You'll want to drill from the side that doesn't touch the bracket so the larger 3/4" hole and the smaller one will be centered.
Here are some pics of each side. You'll see I had one side with 4 bolts going to the bracket, and another with 2. It probably won't matter too much if you use 2, 3, or 4. I intend to weld these to the brackets when all is said and done, so I chose to go with two after making that first side.
Once you have the holes in your metal tubes, bolt them back up, place your sliders in the center, and mark your holes to be made on the sliders themselves. You can drill these with a standard drill and a bit made for metal, as getting them centered on a drill press is a PITA.
From here, run bolts through everything and make sure it all lines up. I recommend NOT tightening any bolts until you have them all in place. This way, if you need to maneuver the bracket some, you should have a little wiggle room. Once they are all threaded through, tighten them down and test fit the seat in your car.
Make sure everything lines up properly and you can adjust the seat. I noticed my seat position release latch was getting caught on a piece of metal underneath when I sat down. So I took a grinder to it and trimmed it down. /problem
Here's the final results from underneath:
I don't have any pics of it in the car at the moment, but they did fit in without any problems. I plan to ride around for a while and make sure I am happy with the position of the seats. Once I determine they are fine, I'll weld the seams of the brackets for added safety.
Hopefully this helps someone. Please let me know if you have any questions.
