Ok, I got the Fender vintage bridge in the mail today, installed it this evening.
I used the middle hole on the bridge and filled the other four. It aligned perfectly leaving 1/16" on either side of where the original bridge was placed.
Here's a few photos of the process
http://www.flickr.com/photos/zenrad/sets/72157625243197520/
It did finally get the feel and sound to what I wanted. I have a Fralin pup in the bass, CTS pots and a good 5% tolerance cap. The thing I noticed right away was that the bass didn't sound as bright and brittle as it did with the heavier bridge. I was looking for more of a classic 60's thumpy tone and while I was really close, this, IMO finally did it.
Another thing I did while I had the strings off was to take it apart and knock off some of the shine from the bass. I'm not a fan of reliced instruments, but it just didn't look right to me all shiny. I used grey scotcbright followed by 000 and then 0000 steel wool, and then I used fine rubbing compound by hand. This gives it a worn in look with a slight sheen, like one of my old guitars that's been wiped down and polished a thousand times over the decades. The pickguard got the same treatment followed by plastic polish to remove most of the scratches. Once I play it for a few hours all of my right hand marks will be right back where they belong
So I'm very happy with it. This was an easy change that made a noticable difference in the feel and sound of the bass.