after some hours research on the internet I found:

V12 contact breaker points:
right side DR-2437XP = 1924499 (also used in 53-56 buick V8, 46-48 Cadillac, 55-56 Chevy 8, 55 Corvette)
left side DR-2236XP = 1871678 (also used in 40-50 olds 6, 40-53 pontiac 6, 51-54 Kaiser, 50 Studebaker 6 and 50-60 Studebaker truck)

I bought them from ebay at less than 2EUR each !

V12 rotor arm:
DR158
ebay: 3.99 GBP