[Spud]

I am looking for a Bowflex SelectTech 552 series 1 replacement disc #3. does anyone know where I can get one?

[LouiseFleischer]

It may be worth contacting Bowflex customer support directly, as they sometimes keep replacement parts for older series or can point you to authorized suppliers. You could also check fitness equipment repair shops, eBay, and local resale groups for a damaged set being sold for parts. My Granny found a hard-to-source treadmill piece through a local repair technician, so those contacts can be surprisingly helpful.