They don’t bolt in the same place as the 2 pots.
Some S1 uprights had both sets of mounting holes for both 2 pots and 4 pots but I think it was early ones only. I had a set on the front of my last Elise race car which was a '96 car.
The spacing is the same but they mount further inboard than the 2 pots.
Cheers Dan, i will have a look in my upright and hope i will have other set of holes for these 4 pots
Might have a pair of spanking new bells for these. Take 295 or 304 ap discs
And possibly some PF pads to go with them