Post pictures and it'll be dead easy to see what you have if they are standard GC. I use winmax w5 pads but they are for the race car so might not be the best for road use?

Or take it to STECHNIC or MAXIMUM MOTORSPORT, they'll give you the right info and will more than likely have pads in stock.

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1980 MK2 Ford Escort RS2000
1979 MK2 Ford Escort RS1800 GRP4 spec historic rally car.
1998 GC8 WRX Tarmac rally car