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Forward the detail and ask. Mail to this address is opened and answered by one person, and whatever comes back names what it rests on, whether that is the book time for pulling your gearbox, the difference between a kit and a disc on its own, or the labour rate your state actually runs at.
A question that would spare the next driver the same guesswork is worth publishing. That only happens with your say-so, and only after everything that could identify you has come out of it.