SPOA, 2" BL and 33's and you're worried about needing shocks for a RWC?
It all depends on how/where you bumpstops were placed. If they have been spaced to provide standard compression travel even though you are SPOA, and the upper mounts are stock, then you can use a stock or stock replacement shocks.
If the bumpstops are setup differently or the top mounts have been changed, you need to measure.
Remember to make sure the shocks can't ever bottom out before the springs. Normally, you need to allow 1" more shock travel than the measurement between the bumpstop and chassis, + 1/2 the thickness of the bumpstop to allow for hard compression (like if you accidentally jump the car)
Steve.