Here's the answer:
http://www.talkbass.com/forum/f8/squier-precision-5-string-club-770662/index7.html
(Search function is your friend)
My modded bass down at bottom of page.
Note that bridge Dimarzio Ultra J is only a tiny bit too long that is easily fixed with Dremel and a tiny sanding drum tool. Use the smaller 1/4" one rather than the 1/2" sanding drum.
Also note that if you go with real P pickups as I did (makes one absolute KILLER bass!) all of the "hideous bathtub rout" ends up under the pickguard where it can't be seen. Or if you like you can get both Demarzios and keep it two jazz pickups. Which again may only require some minor sanding.
The size and pole spacing on the Dimarzios 5s are perfect for these Squiers. And they are rather inexpensive (compared to some others) too.
Good luck.
PS. Those cheap Chinese digital calipers (like from Harbor Freight) are just the ticket for measuring pickups and routs!