Shocks

I work down at Crest Cadillac in Nashville, TN. We have a local rap superstars car here and the factory shocks are 2 short b/c he's running 22" Davin Street Spins. We need some help findin sum 2 fit it. 1968 Cadillac Eldorado. Shocks need 2 be same diameter but 2" longer. Please contact me if anyone no's anything. We've tried sum shocks but the diameter is just 2 big. sdime6540@hotmail.com