The stands in the picture of my boat (the top one, for those who don't recognize it--circa summer 2000) are Brownell SB-2 (48"-65"). They are, in my opinion, the perfect size for a Triton. The short ones in the picture of
Figment probably only work acceptably because the boat is blocked so low to the ground. I used to have a set of the SB-3s (the smaller ones like in Figment's picture) and in a pinch, they could be made to work with the blocking I had (I think about 12" of blocking at the low point is about perfect).
This picture shows my stands and general arrangement a little better. The aft stands are extended further than they could be because the ground slopes off towards the stern; on level ground, the stands would be considerably shorter, especially on the port side. Note also that the tops of those aft stands are just about at the original scribe mark for the Triton waterline...
The next-larger size of stand..the SB-1 (64"-81") would be awfully tall, but could probably be made to work if the boat was blocked high enough. But they would be way too tall with low blocking--the lowest extension of the stand will end up too high on the hull and won't be able to properly support it. The blocking would need to be 2' or more high to get the stands into the proper position.
The other problem with too-tall stands is that they end up on a surface that is approaching vertical, and the boat has more of a tendency to push the stands away. The stands are best placed more under the hull, to better match the designed angle of the stands.
If you can arrange proper blocking (and it would have to have a wide base to be blocked that high, too), then the taller stands (SB-1) would work. And if you can get your hands on the stands for possible ownership, I would do it regardless. If nothing else, you can use the tops and purchase only the proper size bottoms, saving some money in the process.