I am not aware of Case putting any tags on the cabs like they did on decks, blades, blowers, casters etc, so that makes things difficult for everyone. However, we do know that the J2 cab was earlier then the K2 cab and Case changed the LETTER designation on all attachments if they made a significant modification to how that item was built. It would seem to me..........and this is just speculation on my part as a result of this conversation..............that the K Series cabs were introduced right around the time when the wheelbase was increased on the 400 models. In all my time on these forums, I do not recall any conversations about the K2 cab being a bit longer than the J2 but it's certainly possible. The brackets needed for the pre-80 models are inserted on the top of the fenders at the rear corners of the cab.....according to B-1326 and also B-1326 states that it replaces the A-1326 manual and it should be discarded. You might want to take a look at the A manual and compare it to the B manual to see what the difference is between the writings and pictorial diagrams.
Problems such as this often come down to old-fashioned detective work and that is one of the reasons why we publish ALL of the manuals we can lay our hands on. In addition, I would ask all of the members who have a 400 Series tractor with a cab mounted on it, to help out with this issue. Please......take a moment and make a measurement between the front of the cab and the rear of the cab just below the roof line and post that measurement here along with the year/model of your tractor or the model/serial number. In addition, I would ask that you take a look at ITEM 6 on PAGE 6 of this Parts Manual
http://www.manuals.casecoltingersoll.co ... marked.pdf
and tell us if you have these brackets on your pre-1980 444 or 446.
As you have seen, we have a new member here who is trying to make a decision about a tractor purchase and needs some help in sorting this issue out. Since it hasn't been discussed in the past to my knowledge, your input on this issue will help others in the future. Thanks for your anticipated co-operation. :thumbsup: :thumbsup: