I haven't yet crawled under my car to get any numbers off the pitman (if they are there at all) but if yours is a standard steering version I would guess your numbers are what I should find as well..
As to your question regarding how many different types of Pitman arms there were - from little I can make of it all, it seems there probably could have been 3 Z2/8 versions - those being a regular Z2/8 model specific standard steering version (which was already a faster ratio than normal manual steering Camaro models came with - and I therefore assume longer length??), a power steering option variant (not sure how that version's length would compare) and the optional fast ratio version which I would also assume could be the same for either a power steering or manual, at yet a different length again.
I'm only guessing here because I don't really know and I wished someone with a good handle on this could have chimed in here. I do know from the sites and parts suppliers books I have scanned through - there seems to be 3 different lengths available for 'normal' Camaros which correspond to the standard, power, and maybe fast steering versions (if available) - but if and how these available and advertised ones would work as replacements for Z2/8 specific versions, I'm not sure, thus my wish for the schooling.
To complicate it even more it seems '69's have parts that are year specific and not usable on the first 2 years...
This can't be all that hard for many who have experienced problems with these over the years and replaced them - all I really need to know is what my options are regarding getting some bits that will work - verses hearing 'your screwed' type of thing.
My local parts suppliers and Moog distributors can't tell me much as I usually am the one to have to provide them with 'researched' part numbers to order to get a Z2/8 specific piece or replacement part.
I was hopeful this site and it's group of long standing experts would be able to clear away some of mystery for me here... - Randy