I recently received a Bella tank (same measurements as a Lava tank) and successfully matched it with a clear Phiniac glass tube. So.... the Phiniac and Bedazelled glass tubes fit the Lava and Bella tank "caps...and if the Bedazelled tubes fit the Pro-V cartomators...your options have been widely expanded if you want a pyrex tube to fit a cartomator.
My Phiniac is one of the clear naked tubes that the manufacturer color sandblasted my choice of design. If you aren't familiar with Phiniac tanks, the diameter of their clear tanks are the same; the three length/heights available are the shorty, regular, and XL-v2. Their colored glass tubes are of a different diameter from the clear tubes, so they will not work in any of the previously mentioned tank brands.
this is good to know. thanks!