CB450 Chopper Rear Shocks

[whataulooknat]

I have a 1974 CB450 that I'm in the Process of doing some mild Modifications to. I don't know if I would Consider it to be a true Chopper but you be the Judge I can post pictures later. Anyways I have the front forks extended by 6 Inches and I want to Lower the Rear end by a good 2-3 inches because I don't like there being so much air space between the Rear Tire and Fender and the Center Stand Does not quite reach. Does anyone know what Bike Shocks will fit these bikes that would be around the length I'm looking for.

 

[whataulooknat]

This is the way the bike currently sits. Only Difference is I have installed a set of Highway Pegs.