your link #'s didn't work, but are you looking at the "johny law motors" kit ? if so, that should work, but it's description is misleading as it is a "triangulated 4 bar" setup and as such, does not use a watts link nor a diagonal link to locate the rear side to side. it's kept in check by the upper bars which point in toward the center line of the vehicle. this is a copy of the GM suspension used in about a bazillion different vehicles over the years. seems like a reasonable price. that's all i can offer at this time.
beer