This is typically a (manual, not powered). It is designed to clip onto the existing side mirror of trucks, SUVs, or vans (e.g., Ford F-150, Ram, Chevy Silverado, or even older sedans used for towing).
Because it lasts significantly longer than cheaper alternatives, you buy the part less often.
If you are looking for this part, you can find it at specialty retailers like Encore Equipment Parts To help you find exactly what you need, could you tell me: exact model number of your mower? Whether you are looking for the drive belt blade belt (they vary in length)? If you're having trouble with the current belt slipping or snapping Encore Lawn Mower Parts - Shop Quality Parts Online
: Built with a chrome-plated brass body and a stainless steel spray face to withstand the high-use demands of commercial kitchens.