Being Flucas , you can rob them out of old Hillman Hunters , Minis , and Cortinas . Pre 67 ish for the metal ones .
Millions made of the plastic , most never removed once . Can be an art leaning over bacward , gead in the boot droppings arm behind youre back into the instrument back through labrynth of braces & cables .
A worm / Twist squirm loose before knocking out free saves destroying them .
Plastic ones Id dose in Armourall before use , to aid elasticity .
Metal ones date to Rover 75s , Before Rover 90s .So Land Rovers 7 RangeRovers , if theres a ' car field ' handy .
Darn sight easier to take the dash / instruments out. And flog all the bolts screws fittings while youre at it .
Rubber grommets for wires / cables through bulkheads etc . Dunno If Triumph Herald front Discs 'd come in handy too .

The one rule to the exception , is theres the exeption to each rule .