Difference between 23-070 and 23-081?

A home owner from charlotte, NC says:
January 4, 2015
Looking to replace cox door hardware 21-717/767. I have reviewed your earlier posts and the 23-086 is mentioned in all, but some your mention the 23-070 and here you mention the 23-081. What's the difference between the 070 & 081.
Also, the length of the bracket is 2 7/6. Would you tell me the spacing of the screw holes on the bracket.
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Paul from SWISCO responded:
January 6, 2015
The 23-070 has a concave wheel while the 23-081 has a convex wheel. This is a very important feature and you need to make sure of which you have! That said, if you have the Cox 21-717/767, then I would recommend our 23-086. That has been used for this Cox number in the past. Just double check your wheel.
Mirror Wardrobe Door Roller, Concave
Mirror Wardrobe Door Roller, Concave
23-070
$6.78
Mirror Wardrobe Door BB Roller, Concave
Mirror Wardrobe Door BB Roller, Concave
23-086
$8.42
Mirror Wardrobe Door Roller, Convex
Mirror Wardrobe Door Roller, Convex
23-081
$5.97
Sliding closet mirror door rollers and tracks
Sliding closet mirror door rollers and tracks
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