If anyone might be interested, I noticed a split bench seat for sale on ebay. Listing is not mine. Would need to be recovered, but these are hard to find. Item number is 360057609825 Auction ends in about three days and has a reserve price.
That would be correct for '67 only. For '68-9 the bench seat was only available with the deluxe option only. Your right about rare, although not correct for my '69 cammer, I bought one from RockyP. My interior was already changed from gold to black, so no harm done. I still want to alter the seat backs to accept head rests.