M16 calipers from AUSTIN PRINCESS!!
These are good but heavy and will fit straight on(99% sure), used as std upgrade for capris etc, so may be worth phoning some old capris repairers to confirm.
Failing that cossie (2wd) four pots fit straight on after tapping lug hole which is already correct size, but of course will need 283mm discs, the difference is massive in performance between the two set ups.
tabetha