Ok, I carry a spare regulator of the Harley variety. In order to make it useful, I replaced the original ring with one that fit over the post. You need a ring, wire strippers, shrink tubing and a soldering iron (or crimpers). That will take care of 1.
As for 2, place the regulator in approximately the installed position and lay the long wire into position and see if it reaches. If it does, fine. If it doesn't, use some of the existing wire from the old unit to extend it. This could be done in a way that uses the old ring. Again, wire strippers, shrink tube and solder would be needed.
