Friend got a 93 zx7 last night(750 ninja). A little rough, and we have alot to fix. The rear shock is dead. As in pogo stick, and you can hear the air when you bounce the seat. I've read that a ZX12 rear is a direct bolt in, only with better valving. Even a good ebay/craigslist ZX12 shock will likely need rebuilt from age and mileage. My question is; can anyone recommend where to buy a quality rebuild kit for either the 7 or 12? Or somewhere that would rebuild either reasonable? He's not gonna put an aftermarket shock on either, as it's simply not worth it on this old bike, cost wise. We'll do fork rebuilds, return to stock heigth, and set sag. This is the first street bike he has owned. It's old and cheap(needs some tlc and engine work too), but it's still a great bike. I had a 94 years ago. Nothing like the fuel injected 1ks with great suspension of today, but an awesome machine in it's day. Thanks for any help.