On my '70 they appear to just "curl in", the tops just taper inwards. There is no cap. That probably doesn't help much, but I don't have a picture available.
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.
Rich
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