1973 Opel GT
I pulled out the package of synchros I have. I have 10 of them. The GM part number is 90167959 and the Opel part number is 718975. You need 6 of them to change out all the synchros in a 240. The person I bought these from in Europe rebuilds the Opel 240 and he told me that the Opel version only used one type of synchro. This is different compared to the BMW version.