ronvella,

As a last resort if unable to find exactly what you want, some hardware stores should have 135 degree V's but the flat surface isn't smooth on the few I've seen. A shallower angle may be preferable if available as the 135 seems a bit deep unless your front bead is fairly large.

I don't remember where mine came from but I probably found it in a welder's old truck that I had purchased for farm use for the princely sum of $200 (truck, tools, arc welder, etc all included).

Richard.

EDIT: if I got it out of the old welding truck, it should have come from a local hardware store as I cannot imagine why a welder in rural Texas would be getting special order files. I think at the time he was in business the only stores in the area were affiliated with True Value or ACE.