Dave, Sorry I haven't replied earlier.
Mild Heart Attack and waiting on Stents to be inserted.
I think you may have sent information re handbrake to Sid Semple in Biloela, Queensland. I Know he had purchased a 4 Speed box in Victoria but not sure if he was able to install in D60. He may be worth contacting. Should be able to bring up his email from photos or technical pages. Sorry to see you are thinking of selling your D66. My wife wants to downsize house to townhouse so my D66 may be on the market before too long.
Sorry to hear of your medical problems.
I found the hand brake lever when I was sorting parts for selling the 29's and forgot who it was over there I sent the 4 speed parts to. I'll try to get a hold of Sid.