SRO is typically 20-25 spots. It depends on the handicap seats if they lose a spot or two or if the creative team is using a few spots to watch the show. The last three times I saw the show, the 3 spots house right we're being used by either Ian Eisendrath, Christopher Ashley, the writers Irene and David, or some of the standbys (I met Tony LePage and Tamika Lawrence this way). To be exact, there's 10 spots house left, 12 center and 3 right for a maximum total of 25.
A Chorus Line revival played its final Broadway performance on August 17, 2008. The tour played its final performance on August 21, 2011. A new non-equity tour started in October 2012 played its final performance on March 23, 2013. Another non-equity tour launched on January 20, 2018. The tour ended its US run in Kansas City and then toured throughout Japan August & September 2018.