Z1OwnersClub GB

As title please chaps. Anyone ID these? Barrels are 1015cc bored to 73mm which I think makes the capacity 1105cc.
I know pics with the barrels off would help, but I've been called in for me dinner & I'm risking me life being on me puter so close to dinner.

Look like 1105cc Wiseco's (10.25 - 1 comp)
The letter on the crown denotes the piston ring type.
A = XA which would make them early pistons with the thin rings.
They do look in good nick for early pistons though unless they are NOS.
Ideally you need look under the skirt to confirm the manufacturer.