Yes an old email address is in my profile but it won't allow me to change it to my current one. Comments welcome on that.
Thanks, that worked for me. I've not noticed that notch. The Mintex racing pads (sports) linked here have it, a bit larger in fact, but it's not on the standard pads for the twin circuit cars. Not on the standard or sport pads for the single circuit cars. No idea of the significance of it. Note that the twin circuit callipers are 4 puck and the single circuit are 3 puck.
https://www.classicvolvoparts.co.uk/parts.asp?carID=2&cID=32&scID=174&page=B_Front_Brakes_P1800_with_Twin_Circuit
https://www.classicvolvoparts.co.uk/parts.asp?carID=2&cID=32&scID=173&page=A_Front_Brakes_P1800_1961_to_1968_Single_Circuit
The notched backing plates might be because I think they are also used on Jaguar callipers. They might have something that uses the notch.
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