Does it fit fit Slide or Slides? Belt buckle?

I'm not familiar with the term Slide or Slides but I believe this is the belt replacement that I returned because it was 1-3/8" wide. I reordered a replacement that is 1-1/4" wide which fits perfectly and it included a brown and a black belt.

Soo is it 1 1/4" or 1 1/8" wide strap?

They sell both 1 1/4” and 1 1/8” belts; depends on your preference and/or the type of pants you have…I have purchased both widths in the past because some of my shorts and some work pants have a more narrow belt loop. Most jeans and dress pants will accept an 1 1/4” belt. I really like all of the ratchet-style belts that I have purchased.

Title vs the "about" section confuses buyer & reading mixed reviews. Sooo is this belt width 1 1/4" wide or 1 1/8" wide?

It is 1 3/16” wide. Call it 1 1/8”.

Does this fit anson belts?

I just looked at the anson belt and their buckle looks similar to the buckle I have, and based on looks, it looks the same… and I would hazard a guess that yes it will work, however, I have found the buckle slips a notch or two as I move about, the very reason I replaced the belt in the first place, as worn out it slipped a lot more