The only RBA that I know for a fact that would fit that tank without glass changes or modification is the Marvec DIY RBA, but good luck finding that. Only place I know of is a wholesaler in the EU and they are unresponsive to my requests for purchasing.
There is a chance that the Ijoy EXO-S RBA would fit and available in a 5-pack on
Amazon, but I can't say for sure if ti will fit. It's a gamble. I think the Ijoy RBA is slightly too short.
If you want a tank that is similar to the Pro C that takes the Ijoy EXO-S RBA, without any modifications or glass changes, these are tanks that may be still available that will take that RBA...
Vaporesso SKRR, SKRR-S
Vaporesso NRG, NRG PE, NRG-S (but not SE)
Geekvape Cerberus
Advken Dominator (this one might come with it's own RBA - some boxes did, some didn't)