These two motor packages include Stainless motor mounts. The steppers are designed for optimal performance with Gecko drives.
Here's the listings
300oz
NEMA 23 Stepper Motor 3 5A 300oz in with 18 8 Stainless Motor Mount | eBay
600oz
NEMA 23 Stepper Motor 3 5A 600oz in with 18 8 Stainless Motor Mount | eBay