The top and bottom pops out. They simply clip into a single housing that fits in the dash.
EDIT: Now you've got me second guessing myself...I put a toggle switch in my bottom half a few years back and I could have sworn that they popped out. But perhaps I'm confusing them with the Towing and TC switches, 'cause I put a switch in one of those too.
2010_5thgen: does the top and bottom pop out of the Suburban one? If not, then I stand corrected...the H2 one prolly doesn't pop out either. BUT the switches are more than likely compatible; in other words the Suburban rear wiper switch prolly has the same guts as the H2 one and will turn your wiper on and off. Either way...it's a 15 minute job to test.
Actually, I did some poking around on amazon.com and it looks like the part is definitely interchangeable. I ran part number 15143159 and got this:
http://www.amazon.com/gp/product/com...au_pf_dp_chart