This is Mamiya M645 Light Seals foam (backdoor gasket sponge and Mirror Cushion) replace kit.
(This item is "custom kit", NOT Mamiya brand-name parts.)

This seal kit covers whole Light seals as below.

The price is 12 USD.
2 seal kits (for 2 cameras ) included in 1 set.

Asia : $5.50 US (registered airmail)
Europe & Oceania : $6.30 US (registered airmail)
South America & Africa : $6.50 US (registered airmail)

USA : service unavailable, or $25 US (via UPS, there is NO lower price shipping method to US)
UK : service unavailable, or $25 US (via UPS)
France : service unavailable, or $25 US (via UPS)
Germany : service unavailable, or $25 US (via UPS)
Finland : service unavailable, or $25 US (via UPS)

Please check our top page (http://aki-asahi.com/store) for more information.