Speedometer Cable O-Ring Size?

HI Jeff, The size is not any standard O-ring size which makes it hard to find a supplier.

You could try an AS standard o-ring. The AS568 standard is very common in the USA. Ask for a AS568-119 (23.47x2.62mm). The cross section is a little bigger, but the o-ring also has a slightly smaller ID which will compensate.

If the cross section is too thick and you can't fit the adapter without damaging the o-ring an alternative would be one size smaller AS568-118 (21.89x2.62mm). When you stretch the o-ring out to ID 24 it will reduce the cross section size enough to fit.

O-ring Standards Overzicht.pdf O-ring sizes.pdf