Leica R3 Reminder Window Foam
USCamera custom cut film reminder window foam seal for the R4 film cameras. The adhesive is already applied. Just remove the backing, and press into place. Package of 2 window seals. USCamera foam is Made in Japan.
Light seal placement guide for the R4 film camera here. (coming soon).
Old foam removal and replacement information is always available online.
Peeling the foam from the backing can be difficult for some. This video may help.