I decided to draw them up as best as I could and 3D print them in a very durable TPU. If you're having this issue, these should work for you!
3D Printed Handle Holder Hook for TrakFitness Sportrower – Fits MERACH R50
Fun & Safe 3D-Printed Dumbbells for Kids "Set of 2"
Peloton/Exercise Bike Compatible Calibration Kit - 3D Printed
Reebok Adjustable Dumbbell Set 12.5 lb Each Pair w 3D Printed Base Weights Black
3D Printed Base for Reebok 12.5 lb Adjustable Dumbbells Weight Tray Holder Black