I took the brake booster off the 1970 Estate Wagon today, and it doesn't match the booster I had gotten to replace it (Cardone 54-81104). I searched around, and it looks to me like the Delco Moraine boosters from 71 GM vehicles. Can anyone confirm that's what I've got? Does it seem possible that it left the factory that way (a '71 booster on a '70 Estate Wagon), or would it have to have been added later? Here's pics of the booster I pulled:
