1962Norton Dominator Hepolite +40 piston wanted

To help ypu more information is needed.  Which side piston , Left  or right?, What is the number marked on your piston ? there are several types. You may have to buy a pair of used pistons , It may take a few weeks till someone replies. They will be somewhere you will need time.and patience.

I think I have a +40 LH somewhere in the shed for an 88.

You should reach a wider audience that way.

Also Forum not really the right place for ads.