Mat, the '70 arrangement is most likely the same as my '69. The top end of the windlace curves over the edge of the sheetmetal door jamb. Then, when you install the side panel, the curved top portion squeezes it down.
A forum community dedicated to Chevrolet Chevelle owners and enthusiasts. Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more!