Having completely cooked my original discs in the last race, the hunt was on for a modern replacement that didn't require too much modification.
I believe that having a bit of spare time and the internet has come up trumps. Every measurement (except one) on this Mazda 626 1.6L (1982-1987) matches the measurements on my GT discs.
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The only problem is that they're probably a bit too thick for the Dunlop calipers, I haven't checked this as I'm using Metro calipers and they fit perfectly. This maybe of use to a few Belletteers, as, at least here in the UK, these discs are ten a penny on E Bay