Isn't M12x 1.25 just a common regular tap, fine pitch nothing special?
I can stroll over to the garage and see how many I have in stock. Do you just need one? The 1.75 is the coarse thread, the 1.25 is standard fine thread. Fine may be a bit rare but it is "standard thread" nothing "special" or custom.
That’s a regular size.
KMS in Calgary has a 12mx1.25 plug tap.
(I can’t see where you live so tough to help)
Ok After 10 min of hard work I discovered I have 10 in stock. Brand new.
I can leave you 1 brand new tap and another used machine tap that is for a blind hole. I only have one machine tap so I need that one back. You can keep the regular hand tap for small compensation. Like $5?