I got a great deal on the back of an Ausmini group buy from Swiftune. Talk to Nick Swift.

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The bitterness of poor quality (or Crappy Workmanship) remains LONG AFTER the Sweet Taste of Low Price is forgotten.

These are really brilliant, I really can't rate them high enough - when accelerating out of corners it is like having really, really sticky front tyres. The two things I did in my build that were really expensive but totally worth it were the Quaife diff and the 123 programmable distributor.

Mine did not fit properly without removing some metal from the diff cover arch. It was touching the diff "case" and preventing it from turning.
I guess everyone knows about the use/do not use gasket rules. Mine was without,
Spoke to Swiftune and got the shims sorted out but still had to do the above irrespective of which end the diff sat.
No big deal, just dremeled some of the metal away. I would highly recommend a dummy install before you Loctite or use gasket.

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'98 Mpi Sportspack + 7 port alloy head

That is correct, you do need to grind out a bit of metal (even in the A+ gearbox). The reseller told me about this beforehand (even before I committed) so it wasn't a big deal for me.

I have my speedway Mini sitting here for someone to come and buy it for all it's good bits including the Jack Knight Limited slip diff, 1.5:1 Roller rockers, Planetary geared starter. Pad type clutch Bosch Electronic Distributor. and much more. All has to go .

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DID I MENTION THAT I AM THE BEST SUPPLIER FOR MINI ELECTRICAL PARTS AND REPAIRS?
"Let us remove your "SHORTS"