This is the pickup Lakland uses in the 55-94 and 55-02. Wide 5 string humbucker. This is also the size used in basses like Brubaker Brute and MTD 5 strings. Works fine, plenty of lead wire.
$75 shipped...Paypal only, USA only!
May consider trades for the right 4 string Music Man pickup, or the right onboard preamp (must have an output level trim pot).
I'll borrow BBG's Bart diagram to show the dimensions