Correct , The thick red seals are for some Type -3 use and the others are indeed Dog House seals . The dog house seals were sometimes also used on '70 model Type-1 "B" marked case( last of in-shroud coolers) along with a hole-matching stand alone cooler.
Just talked to Brian. If Brian's ' 67 bus has the original case , it should be marked "H-00000-00 and the new to him cooler looks like his original cooler ,he need to use the little Black seals that look like they were cut off of a piece of hose ( no flanges)
There is about 3 more types of seals to deal with other than the ones we mentioned above.
Im' going by info that Brian has giving me. [-o< I hope he doesn't have the '70 type cooler. If he does we will have to do something else but it can be delt with.
