If you look at the end where the tab broke off, you'll see three Phillips screws holding the end cap on. I took a 1/2" piece of tin, about 3" long and made a new tab using those screws to hold it on. I took the tin, folded it in half and hammered it flat. Open it back up and bent it around the end cap, using the screws to hold it on. Drill a hole through the section you hammered flat and reinstall. Your holes will be in a different spot, but use can use one of the original holes.
If your other one is still good, remove the screw and add a fender washer. The plastic just gets old and breaks. Using the fender washer on the good one will spread the stress over a larger area.
Also, cut the wires to the blinds and use some squeeze on quick connect lugs so that it's easier to work with.
Don & Mary
2014 Newmar Dutch Star - All Electric - 450 ISL
2016 GMC Canyon 4WD Crew Cab