On my 83 280SL I got replacements from the local MB dealer. The washers look too big, but there is a space (right wording to use here???) below the steel at the top of windshield and a groove on the outside of the washers, I squeezed it to start one side and worked my way around - perfect fit.

I asked the MB service dept if there should be washers on the rear posts of the hardtop, they told me no. But, now I get a rattle from the rear of the top when hitting a bump on road. Seems like it should have these washers at the rear as well???