I'm looking for just the thin white sealing strip

I'm afraid I can't ID the seal you need from these photos. In order to check our inventory for a match I'll need to see a clear shot of the end profile. Would that be possible?

Please make sure that the sample you show us is in whole and undamaged condition. I know you said it's falling apart, but please try your best. Figure that the more damaged it is, the less likely I'll be able to find a match.