Grover 9NB Sta-Tite Ukulele Tuners, Nickel with Black Buttons

what is the shaft length?

Will these fit a 1960's silvertone baritone uke? the peg head is 1/2". these are what tech support at grover recommended.

I drilled the holes to specs. When I went attach the tuners with the enclosed screws one one of the holes is so close to the stem hole it would split.

What is the difference between the original and special edition models? The photos look identical and there is nothing describing the diff if any.