Here is quote and part numbers for the head gasket and head bolts from ford. Quote from Ford parts UK i got a couple weeks ago

Escort RS Turbo Series 2)-Head Gasket
Part Number: 1658584(QTY1)
Retail Price: £36.76
You Pay: £31.25

Escort RS Turbo Series 2)-Head Bolts
Part Number: 6088344(QTY10)
Retail Price: £4.22each
You Pay: £3.59each

Def use genuine gasket. Even if you caught the gasket before it damged the engine you will would need to buy head bolts again and thats price of the genuine gasket alone plus then you would need the new gasket.

We recently re built my friends engine and we got the head gasket set and just binned the head gasket that came with it and used genuine ford one and used all the other gaskets that came in the head set.