I would suggest you get a Leo Quan bad ass II. its a saddle lock bridge which is essentially designed as a replacement for fender bridges. Meaning no new holes.
Honestly though if i were you i would want to use the bad ass II on the bass you are building just because it will probably be a higher quality instrument therefore it would make more sense to put the better bridge on. (imo)
http://www.leoquan.com/index.html here is the official website. Also i think guitar center carries them. not 100% sure about that though, anyway what ever local music store you go to should be able to order one if you decide for one of them.