You guys get all the good answers...

After a fair bit of looking about, I found the perfect answer when building my green machine.

Repco: Order Klippan Belts from them:

I used this combination:
K1512 (retractable to suit 1200)
K7099 (drop links to suit 1200(110) or 1600(510)).

or

Klippan part number K4264 - designed for 73 Holden hq coupe

I was told by Klippan Tech Support that the K4264 is NLA, but some Repco's (Hornsby/Sydney) still order them that way.

Cost AU$85 and AU$120, depending on the dealer markup.