I ride a knock off progressive like the one pictured and have no complaints. They are much better than the oem's that where on my bike. I should mention mine are shorter than stock length. That being said Hagen shocks outlast most from what I hear. Just an opinion but I don't think mod'ing these things (for a clevis to clevis fab) would be the best idea. Compromising the structure just seems like a bad idea as they are the "cheap" ones
if you really want a original looking shock that's clevis to clevis and you have the tools why not make one, buying the springs for these thing is pretty cheap.