Genuine Bosch distributor spares.

[John Cornforth]

To answer bob46320.  The condenser carries a pulsed current with high frequency components.  For best effectiveness, the inductance of the entire circuit comprising both condenser leads and the contact breaker points should be minimised by keeping the wires short.  Earthing the condenser remotely results in a longer connection with a higher inductance (even if the resistance is low).

Having said all that, it would probably still work !