I made my own cush drive rubbers from a sheet of 25mm
thick 95A urethane.... Made them slightly wider by 2mm
took rubber grease to get it back togeather...
have done 7000kms on them , they are still as tight as
the day I put them in... done a trye change 2000ks ago
theres no visable compression on them but they were
slightly easyer to get in 2nd time...

" 25mm think is slightly to thick.... 20mm would be better "

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Harley Davidson..
The easyest way to turn gasoline into noise with out the side efect of horse power...