ok, the pic on top is the new b&m unit that can be dissasembled and altered without the use of a plasma cutter, tig welder, and a balancing machine. I have a hard time beliving that A)with how new it is they would offer it for the 4t40 trans and B)for anywhere near that price.
the pics towrd the bottom look more like something you would be getting.
never heard of those guys though. I know b&m and yank used to make converters. you might be able to order a custom biult one from precision industries.
you can try them if you want. its only 170 with shipping, but then if it doesn't work you have to pull the motor and trans out again to replace it.
your call
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Those so naive, so hard headed, so narcissistic, that think that buy their own efforts can single handedly change the world, are always the ones that do.