I bought a used Murray riding mower with a 40" deck. I want to add a mulching kit but can't seem to find one. Does anyone know if there are any interchangeable parts that will fit this mower?

Most of the mulching kits available now simply block the discharge port and use low lift blades. If it is a two blade deck find 2-20 inch generic mulching blades and a discharge blocking method that is safe and you should be fine.

Don