Hi Neil! Good to see you the other weekend! Great news as well!
Looked at the revmaster ones, and they seem to use a rubber seal that lips around the edge of the rocker cover, like the empi rocker covers. They wont work on these type of rocker covers.
However, CSP rocker covers have a similar groove in the mating faces, and they use a vitone seal, a thin round rubber seal, so perhaps this is another option.
Dude