I have a Nordstrand MM5.2 Music Man 5 replacement pickup that I had custom made for 71mm spacing. This means that there is 71mm between the middle of the B-string poles and the middle of the G-string poles.
If this is going to work for you I'd be happy to let this pickup go for $80 shipped, CONUS. There's plenty of length left on the wires and I've been using it for about two months.
Here's a pic of it installed on my bass:

Sold!!
Thanks, tubby.twins!