Grundig TK830 (approx 1960) recorder rubber parts

HI all

I have inherited a beautiful old Grundig recorder from my Dad. Its plastic casing is brittle and has cracked/ broken off, but internally it's not too bad and has been looked after. However, some of the rubber parts have hardened and worn - those I am trying to replace through networking with yourselves.

Apparently the parts I need are the 2 rubber "drive idlers" and the rubber "drive spindle". I have one drive band, but would like to find another.

Any ideas for sourcing these?

Kind regards, Kathe