Basically I've just bought a new/old stock 07 SX trail frame that has no shock.

What options do I have?

Whilst I'm looking 'can' I get away with fitting the Fox air shock that I currently have on my later gen 09 Enduro frame? It'll drop the BB height/slacken the head angle but will it also fowl/against the seat tube?

Dumb idea I guess so......

What size(s) can I look for on the secondhand market?