Hi Addicted,
Thank you! If I may say so, I got myself addicted to these cars (wagon is mom's).
By the way to those who replaced the oil caps with the rubber/plastic black ones, the seals are narrower and are not compatible should you decide to buy their seals. I got 3 "OEL" caps from the junkyard and replaced two of their seals and installed on both W123s. No more oil leaks and easy to twist off. Kept the black oil caps though, they were still good.
While I agree with HTown, the fuel filler caps are now different if you buy them new (have a different handle). But I agree, those ones should fit easily too.