Maybe one of these similar products would be of interest:-

2K Fit Rowing Machine Seat Cushion (Model 1) for The Concept 2 Rowing Machine with Medium Thickness Dual Density Memory Foam, Washable Cover for Indoor Erg, Concept 2 Rower, Water Rower Seat Pad

Rower Seat Pad fits Perfectly Over Concept 2 Rower - Anti Slip Rowing Machine Seat Cushion Pad Compatible with Hydrow, Concept2, Waterrower and Other Row Machines - Rower Accessories

2K Fit Rowing Machine Seat Cushion (Model 2) for The Concept 2 Rowing Machine with Custom Memory Foam, Washable Cover, and Straps- Concept 2 Rower, Recumbent Stationary Bike, WatterRower Seat Pad

Rowing Machine Feet Straps for Concept 2 Rower - Foot Strap Replacement, Compatible with Models D & E - 2 Pack

Log Card for use with PM3 and PM4 Monitors Concept 2 Rowing Machine concept2 New