I purchased a seal this past May for the sunroof of my '90 760 GLT from Tasca Volvo. Part number is #1334904 for $44.00. If we're on the same page, this "seal" surrounds the sunroof's "moving top" for lack of a better description. In reality, this seal is not intended to prevent water from entering, but in my opinion, it really slows the water from entering. It has a fiber bristle exterior, is rather stiff and snuggly fits the around the edge of the moving top. To install the seal, you will have to separate the top from the slide mechanism first. Then remove the old seal and fit on the new replacement. There is enough of the seal length that the end will have to be trimmed to length as it comes around the top's circumference to mate with the opposite end of the seal. Most people will advise you to inspect the drain lines from the sunroof to make sure they are clear of debris.

Mike
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'83 245 GLT, '90 760 GLT