CE2
"fillerless" cartos have a 510 threading, Sharon dear. So they'll work on
any device that has a 510 connection, which includes the ProVari.
That said...make sure you try one box first before you buy a bunch, so you can get a feel for whether you like 'em or not. People either love them, or hate them. I'm amongst the latter. There were wicking issues, filling issues, taste issues...leaking issues, juice was getting in my mouth. But if you're having a good experience, that's great!
One more thing :you really don't need to worry about burning filler in Boge cartos, as long as you keep 'em wet. Wet carto means you're good & the filler will be fine. If there
was any burning happening...you'd really notice it, quickly. But I'm using the 3 ohm Boges. 2 ohms are gonna run a bit hotter. In my experience, people who are having issues with cartos are often running them too hot, like at too high a voltage...or not refilling often enough. But that's one of the great things about your ProVari - a few presses of the button & you can check the carto's ohms, & adjust the voltage to a comfortable place, no prob.
Happy vaping hon!