Panasonic's official website does not offer any VCR fan parts, as of 2015. VCR fans are often universal, because one fan is used in many different models. As such, it is possible to buy an inexpensive, non-working Panasonic VCR on eBay, to use for repair parts.
Since the DVD and Blu-ray players have pushed the VCR into obsolescence, finding parts of any kind for a VCR has become difficult. Another option, would be to contact a local electronics repair shop. They may be able to identify and replace a fan, sell a fan that can be installed by the VCR owner, or suggest local and online sources for the part.