Hello Bruce,
The Jag rear end with the inboard brakes has a separate set of calipers for the emergency brake. The cable set is available from a number of diferent vendors. I bought the calipers rebuilt from ERA, Bob Putnam may be able to help.
I tried to find the shop here in the Modesto area that I bought mine from but, it has been a while and obviously I have killed too many brain cells with Red wine.
Perhap one of the other folks on the forum will respond.
Tony R.