What's the distance between the parallel wheels?

A home owner from Houston, Texas says:
What i have looks closest to your, 23-189 and 23-162, believe they will work
but need the distance between the parallel wheels, the one i have has a 1/8"
seperation.
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Mike from SWISCO responded:
The distance between the parallel wheels on the 23-189 is approximately 1/8".
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