Help Identifying Eames RAR No Label?  

Hello all! Wondering if I could get some help on this Eames RAR. I’m being told it’s an all original (base & runners recently refinished) 1954-1955 light ochre 2nd gen zenith because of the no label & ‘z’ on the shock mounts.

I’m wondering if that is actually the case due to the shock mounts looking smaller than the typical larger mounts of that time, & it being light ochre. Maybe a yellowed/aged parchment? I’ve also never heard of a ‘z’ on the shock mounts being an identification of zenith.

Any help would be appreciated! Thank you so much!