Sorry, but there was no unique big truck head lamp bar for 1932 model trucks. I had a chance to check the original engineering and release forms and BB-13114 is nothing more than B-13114 without the stainless steel wrap between the head lamps. The BB bar is all-black-painted and was used on all commercial vehicles (except the sedan delivery) and trucks until June 10, 1932 when the B-13114 bar (with the stainless steel center wrap) was released for the station wagon and deluxe panel delivery. Thereafter it continued to be used on the remainder of the commercial chassis and trucks (131 1/2" and 154" wheelbase) for the remainder of the model year.
June 10th also appears to be the date when the profile of the curvature of the crown in the bar was revised to provide more clearance between the bar and the center of the radiator shell grill.
When working on a commercial chassis such as that used on pickups or a 131 1/2" or 154" wheelbase truck chassis, it can be confusing given the mixture of B and BB prefix parts used on those chassis. Late in the '32 model year, even the passenger car chassis had a BB prefix part (the battery carrier with the attached stone shield).