I recently bought a second-hand Backline 600 and these ears came with. I dont plan to rack this amp so I dont need them. According to the website "Gallien Krueger Rack kits are suitable for 400RB mark III & IV, 700RB, 1001RB, BL250, BL350, & BL600. Each kit also comes with mounting hardware."

GK sells for $39.99 plus shipping. My price is $25 shipped in the CONUS

SOLD