I don't know the part numbers but basically pieces of the frames come in these configurations:
Top bars:
Wedge (where a cleat breaks off and you nail it in to hold the foundation at the top)
Grooved (where you slip the foundation into the groove at the top. For plastic it just snaps in. For Wax you have to use a wax tube fastener to anchor the top)
Split (where the top bar is only 3/8" thick and has a slot in it. usually used for comb honey production in combination with a solid bottom bar. The foundation just slips into the groove and rests on the bottom bar. Usually you wait to put the foundation in until just before you put it on the hive so it won't buckle.)
Solid (I custom order thes from Walter T. Kelley and then cut a comb guide on the top before I assemble them)
Bottom bars:
Grooved (again the best for plastic foundation because it just snaps in. I like it for most foundation because they break less when I clean the groove.)
Split (I don't like them because the break too easily. The foundation slips between the split and you put a nail in the center to hold the foundation tight.)
Solid (My favorite but it may require a special size foundation to fit. No place for the wax worms to burrow and hide)
For any kind of foundation I prefer grooved top and bottom. This will be the right size for plastic. You should make sure you get the right size foundation for it. Walter T. Kelley has the best assortment of foundation sizes and descriptions in their catalog of exactly what kind of frame they fit. Unfortunatly they don't have small cell, so I end up getting that from Dadant or Brushy Mt.