Now I'm super stoked. Back in sept 2012 Nino had a sale on GTB 27" un-ribbed legs.
I bought two sets. One for my EM 'Hit The Deck' and after checking this Volcano, it appears it also has 27" legs. 
Please don't tell me 27" legs are not standard for this machine. 
special is still going
From memory, all SYS80 have 27 inch all round except Haunted House which has 27 in the front and 31 in the rear. some say Mars God of War and Black Hole also have this arrangement, but I'm not sure.
The manual should state the leg size and you can get these from PBR -
http://www.pbresource.com/mansch.html
