Hello everyone. I'm rebuilding an F1 and would like to replace the cushion rubbers inside the primary drive sprocket. After dismantling the assembly to find the originals completely broken up, I find they're not the same size or shape as the Kseries (they look like tiny versions of the rear wheel cush rubbers). I did order some for the Kseries expecting them to be the same, but they aren't. Does anyone know where I can source these parts (they're not listed in the Honda parts lists)? Has anyone had experience of this? Thankyou.