I haven't played a JSX 94 before, but just looking at the photos on Google Images, it looks like a Stealth body with a recessed trem, and 32mm would be the default/stock block length. In fact, for most guitars after 1990, you can almost safely assume the majority of situations will have a block length of 32mm. It has practically become "the standard".
The 42mm block will be too long. A 42mm block is designed for a guitar with a non-recessed trem where the trem is purposely perched about a half-centimeter high above the body, where the saddle height above the body feels like the saddle height of a TOM bridge on a Gibson Les Paul. Some Jacksons have this, but that is the exception and the extreme minority. Your JSX 94 is not one of those guitars.
A 32mm block should not be too difficult to find.
The 42mm block will be too long. A 42mm block is designed for a guitar with a non-recessed trem where the trem is purposely perched about a half-centimeter high above the body, where the saddle height above the body feels like the saddle height of a TOM bridge on a Gibson Les Paul. Some Jacksons have this, but that is the exception and the extreme minority. Your JSX 94 is not one of those guitars.
A 32mm block should not be too difficult to find.
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