I needed casters for my 14G Unitank and the OEM were pretty expensive. I ordered these:
https://a.co/d/fpvzTKm
Stem Caster Wheels 3 Inch Heavy Duty Threaded Stem Casters UNC 3/8"-16 x 1" Swivel Casters Set of 4 with Safety Dual Locking Wheel
Went on perfectly and wheel roll and fully lock crisply. $27 with Prime free shipping.https://a.co/d/fpvzTKm