A quick Google tells me that's a 6x10 cab. On the assumption that as most production bass drivers are 4 or 8 ohms, each driver is wired to get equal power, and as your cab is 6ohms, I'd guess you have 4 ohm drivers. (Thats each "pair" of drivers wired in parallel to give 2 ohms, and the three "pairs" are in series to give 6 ohms).
So, that means you could wire the speakers to give 2.66 ohms, which is in the ballpark you need. (That's wiring "pairs" of drivers in series to give 8 ohms, and wiring all those in parallel to give 2.66 ohms).
You'd need to be sure of each drivers impedance though, best trying to look at the back of one. Probably best if someone checksy maths and assumptions though - I've had a couple of beers!