before D jumps in and answers.... i think the only ones that fit are their brand, which are hard to find... unless... s-o-m-e-o-n-e here has them and are willing to sell you some!!!
BTW, Peter is right, the only thing that will fit is a Wearever cartridge. It's eother in Vintage pens or the repair forum, but I wrote up a bit on how to convert Wearever cart. fillers to eye dropper fillersif you cant find a cartridge.
Dennis
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Tu ne cede malis sed contra audentior ito ~Yield not to misfortunes, but advance all the more boldly against them