Well, Your new headliner will have pockets that the rods slide into...how many are there? I think most of the 71-up B-bodys are a 4 bow set up but there are also 6 bow headliners also. You will have to check out each rod/bow to see where it goes in your car. Count the number of clips or holes on each side and that should tell you how many bows it originally had. The bows are usually all different lengths , so test fit them to make sure which bow goes where. Use brushable contact cement, it will be less mess and easier to work with. Headliners are a pain in the A**....and take a lot of time to install. a hair blow dryer or a heat gun (watch your temperature settings) will be necessary also.