Can anyone tell me the length of the extended heel shifters that are available.

Well looks like no one has extended one.

The stock one was too short for me and I considered getting a longer one but I ended up just removing the rear lever and putting a cover cap (that HD sell) over the shaft instead.  Might be an option for you?

felt like a postie bike , took it off

Yeah that was my original plan but sort of got used to it riding back from QLD and think I want to keep one on there now if the longer one works.

Well that's that settled. 

Mines never had a drama Chriso, I check it regular now though. I do have the alloy ones so this will be lighter and may not lead to an issue anyway.

Stop wearing them high heels Chriso and you wont need it.