There are new "hepolite " pistons on the market.
I think from Wassell.
They come in a repro hepolite box.
They are very cheap, around £100 and the rings are reputed to be very poor quaity, (my own experience with an A10 was that the rings had not bedded in in over 1000 miles and were fit only for scrap) some sellers will sell the pistons but replace the rings with Italian made GPM ones due to quality.
Old Hepolite will have a number inside which can be looked up in the old catalogues and decent rings. And cost around twice as much.