As to the tuners, the Grover Mini Locking Rotomatics 3L/3R are drop in replacements.
They make string changes so much quicker.
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05 Custom 22 / 07 Mira / 08 Baritone SE / 03 Santana SE
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That would be them. Easy install if done one at a time. Not sure if there are issues over long period with them, just put mine on this week, but they seem pretty decent construction.