Which part of tailgate gasket? I "installed" the two side pieces and upper piece as a set maybe 20 years ago. Did not need any glue. Easy to remove and replace as needed.I am going to finally get back to work on my 76. I purchased the new tail gate rubber forever ago and finally rebuilt with the new gear the rear window regulator. My question is how many times and how difficult is it to install the rear window gasket. I feel guilty putting on a brand new part that I know I will need to remove down the road. Is this an install it once and buy new again the next time I put it in?