Cool deal, I'm going to go for it. I'll post up the results, I have located a set of M116 and M117 manifolds so if the 116s dont work... the 117s will. I love $25 all you can carry, these guys are going to think I'm nuts.
That one was an SE soooo I'm on the fence about the exhaust as the 420 is a LWB. BUT since I'll be removing the cats anyway from it, I don't see why I just can't extend it just a tad accordingly as it'll bolt up properly in the back.
I have also just found a 380SEL Euro today with the proper exhaust but it'll be more spendy. Decisions, decisions.
Only wish I could have found those Tri-Ys but heck, I don't have a clue what years they were even available.