Is the 87-061 roller bearing sold separately?

A landlord from Toronto says:
September 9, 2011
Is the ball bearing wheel available separately from the nylon housing for the 87-061? 5/8 diameter x 1/4 wide wheel with 1/4 axle 1/2 inch long.
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Mike from SWISCO responded:
September 12, 2011
Have you taken a look at the 87-058 Window Roller BB Wheel?
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