ok update i got the belts it is working this one came from husqvarna at one time and i got it from ebay original part number on the cover is 581-832401 like the book says. so maybe when the part was picked the incorrect belts were in the wrong bins. even after 3 tries. anyway like i said if you need an american number it is 1/2 x 35 1/4" belt. and now i'm going to get another one so i will not be caught again with my pants down. i had on the old sleve get a new one asap and i dropped that ball. oldtimers i guess. so now you know. thanks bp.