Split bus irs conversions

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I have researched this topic quite a bit lately but am still unsure of which way to go.
Use a bug/type3 gearbox and beetle diagonal arms.
Use same gearbox with early bay diagonal arms.

Which is the better way to go? It will be done to a '62 bus with a twin turbo TIV motor of 2-2.2 L . I would prefer to use 4 wheel discs and have a set of 944 rears and also a set off a commodore (holden). I may also put airbags under it at a later date.

Any suggestions would be greatly appreciated.

Thanx
Rob