Rune,
I know it's an old thread, and you may bought something else.
I have bought a Mallory 600-04 from this seller and he still has another one:
Mallory 600-04 Electronic Advance Computer Ignition control kit 8 position MG | eBay
Edit: I have just found out, (and lucky for me) that the 600-04 is for 4 cylinder (for my Datsun), 600-06 is 6 cyl, 600-08 is 8 cyl.