This actually may not be the case in all scenarios. I just went through this with my 510. It has a roadster 5 speed. I was told by all the experts that if I had the roadster pressure plate, clutch disc, etc then I would also need the roadster sleeve and bearing. The consensus was regardless of the trans, you use the same pp, TO and clutch. This was not true for my car though. I installed the roadster sleeve. Put my trans back in and no go
I had to use a longer sleeve with the roadster bearing and everything is perfect now
I should have listened to my dad all along. When the everything is installed, the clutch fork should be coming through the boot at the middle/closer to the front of the bellhousing (closest to the block). When all together, you should have a slight bit of play before the slave cylinder starts to engage the clutch.
If the sleeve is too short, the fork will be closest to the back of the hole and will not have enough room to engage. Which is what happened to me.
This is also a chart for the T/O's. The dimensions are in MM.
30501_Chart.pdf