Koni yellows are adjustable in height (spring perch - have to take the sussy out and do it, but how friggin often would u be changing height anyway!?!). Also they are damper adjustable with a twist of a knob on the top of the shock (simple as bat poo).

You can just get the peddrers springs and use the koni yellow shocks. apparently, the yellows arent worth much more than the red and are heaps heaps better (as a trader with personal experience states).