Vivitar XC3-XC4 Light Seals
 USCamera custom light seal kit for the Vivitar XC-1, XC-2, XC-3, and the XC-4 film cameras. This 6 piece kit includes lower/upper door channel seals for the camera body, 1 mirror cushion, lower/upper door channel seals latch end, back cover, and 1 door hinge seal for the camera body.
USCamera light seal placement guide for XC series Vivitar film cameras.
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.