Maybe one of these similar products would be of interest:-
Bowflex Selecttech 552 Series 1 Disc 2 3 4 5 Bowflex Disc Replacement
Replacement Discs for Bowflex SelectTech 552 Series 2 - #2, #3, #4, #5
USED SERIES 2 ONLY Bowflex SelectTech 552 Dumbbell Replacement Handle Parts Disc
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Genuine Bowflex SelectTech 552 Series 2 Replacement Discs (OEM) #2, #3, #4, #5