see attached just moved from the waiting for death capital(Torquay ) to where people are happy to see you Bulkington and soon to be re-knighted with my trusty series 1 ,hence the lack of reply's
may be wrong but do you not have to measure the piston protrusion to determine the right thickness head gasket to fit I would check https://www.youtube.com/@Vera_and_Christian
I would personally measure the bore before assuming they are standard ,if you have the old rings you could fit one and measure the gap to see if using the same is in tolerance and feasible or if remedial work is required .guessing can be expensive