u/Early_Resort_9392

So after doing some work on my e60 I’m left with this fair size plastic washer/spacer, it’s driving my ocd nuts and I have to find its home!! Anyone have an idea of it may be from, it was with the bolts and bits from the windshield wipers as I had to change the lower seal. But I also have off door cards mirrors part of the dash is apart so it could be from anywhere. Just can’t think of where it’s from and it’s bugging me. Thanks for any help