I am trying to buy genuine Ford Head bolts direct from Ford but they are saying there are so many different types.

I have a 200 block with i believe a 2wd head on a E reg rwd sapphire cosworth with all 2wd stuff, manifolds and inlets stage 3 T34 etc...

The numbers they are given me are...

YBB0001
YBB6418
YBB6419

Can anyone tell me the correct bolts i need please even if the number is not above as he said theres more numbers listed

Also is there suck a thing as Ford Group A Bolts ?

Cheers!