Welcome Jim. I have a few in that era as well. Perhaps compare your bikes to those shown in the catalogs. It will be interesting to see how your bikes compare to the US models. It seems that a lot of bikes turn up in the UK and Europe that don't correspond to US models.
I try to buy catalogs when I can find them, but most that turn up are duplicates of ones we already have. We do need better scans of some years. I just don't have enough free time for the job.