Which is the matching "front" set for 23-213?

A home owner from Chicago says:
This roller is labelled "rear" and works great.
I now want to replace my "front" set too and can't find the equivalent marked "front"
The 23-013 looks similar but lighter duty ( no ball bearings visible)

And is
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Paul from SWISCO responded:
Unfortunately, your closest door roller system has been discontinued for some time. The complement to the 23-213 is no longer manufactured. The 23-013 wheels are not ball bearing like the 23-213, so they will wear out sooner, but I suppose with some handy work it could possibly work. Other than using the 23-013 as a substitute, you can consider a new track system like our 23-500.
A home owner from Chicago says:
Too bad, the one you recommended looks considerably less sturdy.
And only one roller at that.
I already have a tandem set but without ball bearings and it is noticeably more difficult to operate.
I will keep looking.
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