I will assume you are referring to the horizontal "weather strip" (not the exterior rubber "seal strip") that is afixed to the inner metal door panel, opposed to the vertical "guide strips". Regardless, we all knew what you meant. I did these all on a 1960 Amazon-S and surprisingly, these are identical to restoration parts you can get from any reputable restoration source. Of course, you can buy the exact "made to fix" items from several aftermarket sources (check my opening web page cvolvo.com).

I bought the "weather strip" in an 8' length and cut it to size for all 4 doors. The real trick is to drill the staple like attachment holes in the same position as the ones you are replacing (used the old as the template), then I was able to use the same staples and bend them into place. I have heard of some people using aluminum pop rivets and adhesive, that may also work. I'm a purist and rather try to do the job as close to original as possible. I did not take any pictures of this exact process, but I think this shot does show my attention to detail. BTW, the original color was 42 California White!
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Cam a.k.a. CVOLVO.COM