Product details:

400 series variable speed drive, among many other applications - While these are 5/8" top width, They are *NOT* 5L or B section belts, they are specially designed for the variable clutching pulley system - much like the torque converter belts on Snowmobiles and ATV's Used on the following MTD models among others: MTD135-618-000 (1985) Lawn Tractor135-620-000 (1985) Lawn Tractor135-638-000 (1985) Lawn Tractor135-668-000 (1985) Lawn Tractor135-669-000 (1985) Lawn Tractor135-688-000 (1985) Lawn Tractor13618S (1985) Lawn Tractor13619S (1985) Lawn Tractor13705S (1985) Lawn Tractor136-610-000 (1986) Lawn Tractor136-611-000 (1986) Lawn Tractor136-612-000 (1986) Lawn Tractor136-613-000 (1986) Lawn Tractor136-614-000 (1986) Lawn Tractor136-615-000 (1986) Lawn Tractor136-616-000 (1986) Lawn Tractor136-617-000 (1986) Lawn Tractor136-618-000 (1986) Lawn Tractor136-619-000 (1986) Lawn Tractor136-620-000 (1986) Lawn Tractor136-621-000 (1986) Lawn Tractor136-622-000 (1986) Lawn Tractor136-623-000 (1986) Lawn Tractor136-624-000 (1986) Lawn Tractor136-625-000 (1986) Lawn Tractor136-626-000 (1986) Lawn Tractor136-627-000 (1986) Lawn Tractor136-628-000 (1986) Lawn Tractor136-629-000 (1986) Lawn Tractor136-630-000 (1986) Lawn Tractor136-631-000 (1986) Lawn Tractor136-632-000 (1986) Lawn Tractor136-633-000 (1986) Lawn Tractor13AC450F382 (1997) Lawn Tractor136-634-000 (1986) Lawn Tractor136-635-000 (1986) Lawn Tractor136-636-000 (1986) Lawn Tractor136C451F382 (1996) Lawn Tractor135C451F382 (1995) Lawn Tractor136-637-000 (1986) Lawn Tractor136-638-000 (1986) Lawn Tractor136-639-000 (1986) Lawn Tractor136-640-000 (1986) Lawn Tractor134Y451F382 (1994) Lawn Tractor136-641-000 (1986) Lawn Tractor136-642-000 (1986) Lawn Tractor136-643-000 (1986) Lawn Tractor136-644-000 (1986) Lawn Tractor136-645-000 (1986) Lawn Tractor136-646-000 (1986) Lawn Tractor136-647-000 (1986) Lawn Tractor136-648-000 (1986) Lawn Tractor136-649-000 (1986) Lawn Tractor136-650-000 (1986) Lawn Tractor136-651-000 (1986) Lawn Tractor136-652-000 (1986) Lawn Tractor130-310D0