Weider PRO 396 User Manual page 21

51mm x 76mm Inner Cap (21)
38mm x 50mm Inner Cap (77)
20mm x 40mm Inner Cap (20)
19mm Round Inner Cap (19)
48mm Round Inner Cap (23)
32mm Round Inner Cap (68)
45mm Square Inner Cap (76)
50mm Square Inner Cap (22)
60mm Square Inner Cap (62)