Short update.... Filing down the brake mount bracket on the car sucks..
But i guess it works.. I filed down 3.5mm now - 8. 2mm are left on the bracket ... Somebody more qualified than me should build matching mount brackets for the HiSpec brakes...
To allow free movement of the brake pads i still need an additional millimeter. I tend to also shorten the pad as TBM recommended

Although I am not really keen to take everything apart again I believe the best method would be to use a belt sander. I wish i had known this requirement for the HiSpec brakes when i had the brackets completely off....
Maybe i will do this with the other side of the car tomorrow


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