BB springs on small bore shocks?
 

I know ghea make some shock collars to allow use of bb springs on associated small bore shocks but wondered if they fit the durango sb shocks or are there any that fit?

dont no y u wud bother to be honest as u only really need 1 set of springs for small bores!

Big bore springs are more consistent, they are much less likely to go coil bound and they don't rub on the side of the shock body.
They def improve the handling of the car in many conditions IMO

You need the durango big bore spring seats and the big bore plastic threaded shock adjusters
You use the big bore shock adjuster as an upper spring seat over the small bore threaded adjuster. Then fit spring as normal!

Hth

Exactly! Plus i would only need one set of springs. Cheers!