I have a Upton Hybrid Hawkes with very old spiros.
I dont have the proper tools to measure, but the height at the end of the board on the D string is a little more than 3mm and i'd say roughly the same for the camber.
When i showed it to my luthier, he did mention the camber was high, but told me the best for my bass was to cut a new bridge because adjusting the camber wouldn't really alter the sound!
Might also be because i needed a little more heigh on my bridge since the FC adjuster are high (he also offered adding would blocks too)
So i was planning to get spiros and an new bridget cut, i think the work on the camber was the double of the cost of a new bridge. I'm a bit confused now!