A contractor from Central IL says:
I have two sets of shower/tub doors that will use this guide. Neither one has the "existing spacer" your instructions refer to. Will that be something I will need to get for installing these?
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Bob from SWISCO responded:

Hey Jeff. Unfortunately, I do not believe the spacers that work with the 10-139 are made any longer. We've had one customer report using a couple of stainless steel washers in their place and they worked great. See if maybe this could work for you.

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