Rear drawer slide?

A home owner from La Verne, CA says:
Sorry there are no markings on this part. It is in a tract house kitchen from 1978. Kind of surprised it lasted this long ha! Thanks for your help-much appreciated..

Having trouble finding the proper size.

Thanks for your help again...
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Tom from SWISCO responded:

Your drawer guide is similar in design to our 32-030. Check it out and let me know if you agree.

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