There are two "nylon alloy" gears in the old Berninas. The camstack gear and the vertical shaft gear. Those gears are no longer available through Brewer (Bernina's sister company). The camstack gear is, of course, with the camstack. The vertical shaft gear can be seen from the top, and is toward the handwheel, and about 3" below the top edge.
There are lots of feet available for that machine, just ask for the "old style" feet.
The Bernina 530 hook is different from other Bernina hooks. The metal band around the outside is thicker.