Just received some Timbrens I ordered via Amazon for my 2011 Silverado. Eyeballed the installation and decided to have my trusted local mechanic do it. Turns out, he had to grind two welds off the stock rubber chock on each side to install the new Timbrens. Took about 45 minutes, cost was $144. I went online to Amazon to write a review noting this, and saw that now Amazon said "these won't fit your 2011 Silverado." Beats me. I exercised due caution in ordering what I thought were the correct Timbrens for my truck. And, they are now installed for better or worse. Won't know of how they work until I hang a big load on the truck. But I find it irritating to order something that is supposed to be easily bolted up; and find that it requires much more effort to install. As usual, YMMV!
2014 Chevrolet Silverado 3500HD Crew Cab, long box, Duramax and 3.73, SRW
Equal-i-zer 1k WDH, 2013 White Hawk 27DSRL
Los Madrones, a little slice of Texas hill country heaven