Do you mean the “backing tracks” (which you won't get in a hurry) or the “pre-record” set of “corresponding instrumentals” that were provided to a client with their vocal cuts?
I have a dub of the “pre-records”, which can also be found on one of the KenR “British Invasion” or “BBC Commemorative” CDs (can't remember which at the moment!)
Some examples within this montage of mine from a wee while back…
http://www.4shared.com/file/35941471/d83134d1/Wixy1360-RadioOne-1969-PT-NowSound.html
IainJohnston