Replacement shocker for old GSX550ES

[Motovalet]

I swapped out my tired old baggy rear shocker for one I had fitted to my old teapot 750 project, it's a Showa one from a VFR400 I think? It looked a similar size and went in without too much drama but it's clearly shorter than the original as my bike now sits a good two to three inches lower on the back end! Looks like a drag bike now! Does anybody know of any other Suzook rear shockers that would be a direct bolt up replacement? I don't mind raising the rear a tad so slightly longer would work a treat :-) I know I can buy a Hagon, Wilbers etc. but there all knocking on north of £300!