They are available at many bearing retailers like applied technologies, the old bearings incorporated. The bearings are metric, and need high temperature lube when installed. Have a flat file on hand to dress the roller shafts, failed bearings often cause gouges in the red heat rollers bearings surfaces that can be dressed out, and you will need E ring pliars to get the retainer rings off. Take your time, take some photos or make some drawings before you disassemble things. Its easy to put back together wrong. Gentle with the lamps, they break easy:( and cost like 300 bucks a set.
Do note the bearings bought from a bearing supplier will likely be VERY CHEAP in comparison with GBC The companies mark up on parts must be 5 times their cost or something.
I fix these machines for a living as a indenpendent servicer of all brands of roll laminators in the pittsburgh area.
If you have any questions feel free to call me phone help is ALWAYS FREE:)
bob haller service and sales pittsburgh pa 412 366 4906, January 2013