What rear springs are these?

I am trying to find out what is in the 89 XJ I am rebuilding. According to the previous owner the rear springs are RE 4". RE only has 3.5" and 4.5" XJ springs. In addition, he added a 3" block. He said the total lift was 7", but from what I have found it appears the current lift is 5.5-6" so the springs may have started sagging. The springs are around 5 years old.

Anyway, stamped on the bottom of the lowest leaf are the numbers:

156 9
RX 051 LC (on the drivers side)

156 97
RX 051 LC (on the passenger side)
(the 97 is stamped at a slight angle and is a bit light)

These numbers don't match up with the RE part numbers. Anyone know exactly what model springs these are?

Thanks

That kinda looks like a rough country part #...to me at least....check their #'s and see if you can find out anymore information on them.

Aron

I will look into that. Never considered checking against other vendors since he said it was RE and he lived about 10 miles from RE so it made some sense that he would have bought locally.

Thanks