Had a hard time digging up info on these. Here's what I got in an email from bass guru Brother Dave:
"The Dimension is another case of Fender making a better than expected modern bass that didnt sell as well as the Jazz or Precision. For the money there were other more traditional Fenders available and people bought far more of those.
These were obviously based on the Heartfield bolt-on basses of 1989 through 1993 made at FujiGen in Matsumoto using an international design team of the best guitar and bass minds in the world, including people stolen from Ibanez and some who would go on to found Lakland. Specifically the Dimension IV looks to me pretty much like a Mexican version of the Heartfield Prophecy II. The Heartfield Prophecy II was also marketed as the Fender Prophecy II after FMIC retired the Heartfield brand. The hardware on the Dimensions is as good but the electronics are not quite as good as on the Heartfield. While the Heartfield wood quality was fairly uniformly above average, there was more variation in tone wood quality on the Dimensions. Some Dimensions have fantastic woods and others the below average Corona reject caliber woods common on Mexican Fenders. The see-through or translucent Dimension finishes, such as the Cherry Sunburst, will usually have the best woods while the run of the mill alder blanks got opaque finishes. The one big design change was that the Dimension has 24 frets while the Prophecy II had 2 less frets. So they did make an improvement there. The Dimension models so far as I know were all made in Mexico and I think the 2005/2006 model year was the end of the Dimension, yet now and then Ill hear about some dealer with a brand new one that is new-old-stock.
The body shape, neck width/radius, headstock shape, control layouts, tuners, bridge, etc are very similar to the Japanese made Heartfield bolt-on basses. They have a 12 inch radius as I recall which made them very easy to setup and they play well."