common bearing and bolt/nut sizes

[Boomhauer]

Since I can't find anything on Round Wheels anymore I'd have to have my axle measured but I think I know a machine shop I could have that done at..

From what I'm getting of that Google link, the bearing size I am wanting does not exist, so you're suggesting I find a slimmer width and take up the extra space Profile style (shims)?

EDIT: http://www.enduroforkseals.com/id213.html

MR 1526 LLB
DIMENSIONS ............................................. 15mm x 26mm x 7mm
SEALS ................................................................................ "LLB"
BALL MATERIAL ................................................... Chromium Steel
BALL GRADE ........................................................................... 10
RACES ................................................................. Chromium Steel
APPLICATION ............................................................. Wheel Hub
GREASE ............................................................  Mobile HP 222  

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Could that be my best bet? and just use a 1mm shim/washer on either side outbound of the bearing?
I assume that the dimensions are correct since it doesn't seem to provide which MM is the I.D./O.D./Width? which I'm just guessing are specified in that order on all bearings.

Anything I should look for to find the most durable bearing I can get?