rmx250 shock

I can almost guarantee not, but u never no, you can make anything fit if u really want, bought a sled once and it had a mountain bike shock in the rear end. Depends how much work and how the ride would be, i would think it too big, i know my bros drz 250 shock is huge
 
measure ur blaster shock and then that shock, if their width isn't even close, then it won't fit, if its like 3 inches, u could put on that shock with a lowering kit, but idk how the clearance from the ressi would be tho