Cabinet drawer slide bracket back mount

A handy person from Shelby twp., MI says:
This opening for the slide to fit in is 1.25"
All of the new ones I find at hardware stores are 1" or 7/8".
Can I find this size anymore?
Cabinets are about 20 yrs old
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Bob from SWISCO responded:

Thanks for posting. I'm afraid we also don't carry any drawer sockets with a gap size greater than 1". I honestly think your best bet would be to just replace the entire track system. I have listed on this page our the 32-056 11-5/8" Self-Closing Drawer Slide Pair and its different sized variants. You can use the 32-018 Drawer Slide Socket Pair with this track system. Take a look and see what you think.

How to Replace Self-Closing Drawer Slides
How to Replace Self-Closing Drawer Slides
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