Discontinued 12 gram seal / cross compatible?

[mueller]

I'm tidying up a BT SA-17, first 12 gram marker I've serviced. The 12 gram seals look to be discontinued for these. Anyone happen to know about cross compatibility?

[XEMON]

I don't, but i have a bunch of those (3.5 ...) i can check a few things and maybe 3D print some (the Sheridans heal up well)