I have some sliding windows from the 1970's. The only markings are on it are on the latch which says, "New Englander". I think I've identified the replacement rollers but want to double check with the experts. Have included a pic of the lower rail. There is a small raised section in the center.
Tom from SWISCO responded:
June 9, 2020
Hi there! Based on the given dimensions, I believe our 87-003 is the roller you want. You may want to look over our measurements just to be 100% sure.
A quick learner from Palmer, MA says:
June 9, 2020
That was the one I had on the order. Thanks for the confirmation.