Poisson Du Jour
Member
Anybody owning a Pentax 67 or earlier 6x7 with TTL prism and back cover seals in need of replacement, an enterprising fellow in Japan has a set of these (2 per pack) available direct from him for US $12.00. The seals are self-adhesive. Your only chore is to remove the old foam seal fun and games! 
When the TTL prism foam seal requires replacement, the prism will be a drop-down fit, which is a sign of worn seals; it should be a press fit to seal the prism against the focusing screen dash.
http://aki-asahi.com/store/html/Pentax67/LightSeal/Pentax67LightSeal.php

When the TTL prism foam seal requires replacement, the prism will be a drop-down fit, which is a sign of worn seals; it should be a press fit to seal the prism against the focusing screen dash.
http://aki-asahi.com/store/html/Pentax67/LightSeal/Pentax67LightSeal.php