For the full keel B29 these are the dimensions:
Mast length = 34' 10-1/4"
P = 31"
E = 12.9"
The centerboard version uses a shorter rig. I don't have the P measurement for that, but the E measurement would be the same.
To be certain, you should always measure your own boat (a previous owner may have made a change that would affect the fitment of the sails).