did regency say what was wrong with the shocks on the rear? is it that they are leaking/not reboundinjg properly or as MRTurbo said too low?
 
if the shocks aren't leaking/borked then you should just need springs.
 
if the shocks themselves are stuffed you will need new ones and prob new springs.

Yeah the shocks are infact leaking :C!

Shardz

I really don't know anything about Shocks, if you could explain I would be very greatful c:

If you have the gland nut type struts, there are inexpensive shock inserts available that will work fine if you have stock springs. Much cheaper than buying complete  new strut/shock units.
If you PM me I can send you an article about the struts used on SW20's, with shock insert options.
Also include you email as it is too big to PM.