I'm 99% sure that the wheel is for the 300E up to 91. Which makes it the leather wheel. Note, that this is the rectangular style wheel. I also cross ref. that number because I saw one for sale cheap. Unfortunately its not the later style 92 up wheel so I passed. It should fit perfectly on your 89.

Bill
91 300E

I can double check on Monday to be 100% if you need to know.