1967 DART OWNERS..Brake question

Take a look at this one. I have two 1967s, one 1968 and one 1969 that has this master cylinder on it. Drums on all four corners.

http://www.oreillyauto.com/site/c/d...der_1347106_164&keyword=brake+master+cylinder

THats the one! Yet every supplier I have gone to shows the same pic and when you open the box it is the other style.
It probally is the same one with a different lid but I would rather keep the look of the one I have.
Thanks for all the help and I will keep opening boxes