With your 2007 Forest River Sunseeker 2900 on the workhorse class C cutaway chassis you will need to use the Timbren # TGMRW55 if you are wanting to replace the factory jounce bumpers. SumoSprings does not offer a set of jounce bumpers for your chassis only SuperSprings # SSA39 to reduce sagging and improve stability.
If your bump stop still does not match this please reply back with your images so I can verify what you have and find another option. view full answer...