Actually Steve, the windbreaks were all unit mods and varied quite a bit. As you can see even in the two that Gino posted, the top RAAF bird has a windbreak that extends farther than the bottom image. Here are some more. In my father's unit, the 190th AHC, the holes were larger and the winbreak was braced from the front as you can see here on Gladiator 36, one of dad's UH-1Bs.
This 187th Rat Pack Charlie model from Ian Dawson shows a totally different setup with no braces and smaller holes.
Here is a third version on a Charlie modelf from the Army Avaition Museum archives that shows the larger holes but no braces.
All three of these go farthur down the side of the aircraft than either of the two Gino posted. Bottom line is it depended on the time frame and the unit. But you can clearly get an iea of what's out there from these. Hope that helps.
Ray