Kevin
there is one company that makes a the stroker crank. Crankshaft specialist. Sold by Importperformance.net and one other company, but it can be bought directly from crankshaft specialist. One thing though, as you see here it is not a kit. The kit that importperformance.net sells is a kit but they use the crankshaft specialist crank, pauter rods and ross pistons. 97.5mm stroke when said and done. Adjuster runs one. I run one too
as for group buys, well you can try but I wouldn't bother. Reason is that the mkiii folk in general are cheap. They want JDM motors because they are "cheap" (ie $1000), but gasp at you when you advise them to rebuild the 7m for $1500. What they don't see, new v used.
The stroker "kit" even with the cheapest components will not cost under $2500. why? Rods are no where near stock. The pistons have to have a higher wrist pin location and that messes piston skirt at stock length. Block MUST be ground to allow for the extra stroke, Oil pump needs to be ground down where it is held by the bolt in the block. Oil pump drive shaft needs to be turned down to allow the new stroke the extra clearance.
for the 7m it won't work because not enough folks with deep pockets will to take the time to do it. My short block alone cost $4500.
You want to bring a GREAT group buy to SM?
ATI dampers for the 7m
Contact me if you need any info as ATI still has the CAD/CAM designs that I had them create to make one for me.