Those side-printed PBT keycaps from Qtan's store are probably better quality caps than the OEM Filco's. But if you want original Filco keycaps, in order to have matching caps and board, I understand your motivation, and I see what you're trying to accomplish. On the other hand, if you are looking for some keycaps to type on everyday, I would go with the PBT caps, as IMO they feel a little better than the stock Filco ABS caps.