1961-1962 Chevy 2-Door Hardtop Bubble Top Quarter Window Rear Channel RIGHTThis 1961 1962 Chevy 2 Door Hardtop Bubble Top RIGHT Quarter Window Rear Channel is a reproduction of the original GM classic Chevy part. In the early production of the 1961 Bubble Top, GM produced only the front channel guide which is slightly shorter than the later production. But this produced problems when raising the quarter window and so later in 1961 they produced this second rear channel to alleviate the problem.