1966 CB77 Piston question

[MGB Driver]

I've found a couple of .25 oversized pistons on flea-bay for my '66 CB77 engine, but they're "domed", unlike my original flat_top pistons....will a domed piston work ? Thanks in advanced!

[Tim Allman]

All I have ever seen in a CB72/77 is domed pistons. In fact, I have never seen flat pistons in one of these bikes and a look at my copy of Bill Silver's guides to these bikes turns up nothing.

Some pictures would be very helpful. I doubt these are original pistons but I would love to see them and read comments from other who know more than I do.