20 x 20mm screen protectors are suitable for the Gen 1&2.
25 x 24mm screen protectors are suitable for the B&W/M!x/Meets/On.
26.3 x 25.3mm screen protectors are suitable for the iD(L)/P’s/4U(+)/Pix.
26.5 x 25.5mm screen protectors are suitable for the Uni/Smart.
The 25mm suction cup is used for removing your Uni faceplate. Can send instructions if required.
Check out my other listings for silicone cases, too. You may combine shipping to save on postage. If the shipping shows up separately for you on checkout, contact me and I'll make a listing for you with the combined shipping.