patio door roller wheel

I found a replacement wheel at my Home Depot, Barton-Kramer 461 Crown/Lawson Roller ASSA.  Even though the dimensions were correct this replacement had 3 pimples and 1 half pimple on the sides.  I was able to fit this in place however the 3 pimples spread the bottom rail to a point where it could not be re-assembled with the vertical rail.  The half pimple was in the correct spot to align with a hole in the bottom rail and was also present on the original roller. (see pic with sign here sticker)
 
Please advise how to purchase the correct roller assembly.