OK, I got this question answered myself.
Even though the Dart exploded parts view shows what looks like a spacer, there isn't one in either fork.
I got an 80mm Dart 2, and disassembled it to compare it to the 100mm, and I found that 2 parts are shorter in the left leg of the 80mm Dart 2. If you look at the dart exploded view, one part is just below the top cap and fits into the top of the spring. The other part is the shaft damper which comes through the bottom of the left stanchion, and the leg bolts to it from the bottom.
You can swap the parts between darts to get the reduced travel, (like I did) but the design of the fork doesn't allow you to adjust travel with a spacer like other forks.
Here is the parts manual:
http://www.sram.com/_media/techdocs/2010 RockShox SPC_Rev A (Rev A price list).pdf
Pm me if you have any questions or need any help.
Even though the Dart exploded parts view shows what looks like a spacer, there isn't one in either fork.
I got an 80mm Dart 2, and disassembled it to compare it to the 100mm, and I found that 2 parts are shorter in the left leg of the 80mm Dart 2. If you look at the dart exploded view, one part is just below the top cap and fits into the top of the spring. The other part is the shaft damper which comes through the bottom of the left stanchion, and the leg bolts to it from the bottom.
You can swap the parts between darts to get the reduced travel, (like I did) but the design of the fork doesn't allow you to adjust travel with a spacer like other forks.
Here is the parts manual:
http://www.sram.com/_media/techdocs/2010 RockShox SPC_Rev A (Rev A price list).pdf
Pm me if you have any questions or need any help.