->911kgs is all leons bar the Cupra and the R. 911kgs+ is for the Cupra and the R, as their engines are heavier.
However, 911kgs+ comes in 2 varieties - one for the Leon CUPRA, and one for the Leon CUPRA R.
A lot of shops do not know that there is a difference between the Cupra and the Cupra R, so be careful and make sure they know what they are talking about.
Do a search on here - you should find lots of threads. I think the R has the ARB joining directly to the suspension, whereas the Cupra doesn't.