Can anyone tell me where i can buy an oversized sump plug for a cooper s
What size is the standard thread?

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1970 MK2 Cooper S

Standard sump plug thread is 5/8" UNC.
Most folks use a helicoil (or recoil) kit to restore the original size.
Recoil kit is good- by using a stepped tap, it uses the remains of the original thread to cut a new bigger one, aligned properly so there is less chance of the sump plug washer not sitting flat.
After cutting the thread and cleaning out, you wind a recoil/helicoil SS thread insert in and you're done.
Can do in situ, on car. Use a bottle of cheap oil to flush the swarf out before refilling.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Thanks Doc, I appreciate your response....

When taping the thread use plenty of grease on the tap to catch the swarf.

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