Hydraulic cylinder code "L" or "E".

[repete]

On my 4520B backhoe I am needing to identify if I have an L or E hydraulic cylinder. Any idea where the cylinder would be stamped? I only see a 13 U stamp on the end of it?

I bought two seal kits from Messick's but they were not correct and they need to know the "code" but I cannot find it.