I have a 1971 Fj40 with original drums on all four corners. The original motor was blown, so I swapped in a 2F with Trans and Tcase from a 1984 FJ60, eliminating my t-case parking brake. I am looking options to incorporate a parking brake without breaking the bank. Can the backing plates for FJ60 rear drums be modified to fit and early Fj40 axle? Or is there a cheaper option? I'm not overly concerned with performance, so the cost of discs doesn't seem worth it at the moment.