Took some time to look at pictures and thinking over all the cars I've seen through the years.
Considering everything it appears to me that Dearborn and likely (no real smoking guns for NJ in 65) NJ the upper bushings and cross bar mount were not painted and instead natural.
San Jose could have the same (at least a couple fo examples) finsih on these upper parts or have the complete (minus the lower mounting hardware) all painted semi-gloss black including the upper bushing and cross bar.
This may be a result, like other years, where San Jose was supplied by the US plant while the other two plants were typically supplied by the Canada plant of the shock maker.
Hope this helps but it seems that as we get questions and do the digging we uncover possibly new facts and possibilities.