3.50" x 19" Panel (Black), 12 - XLR Female/12 - XLR Male Connectors - PR35XLRMF-24
High quality 20pcs/lot 2U XLR 24 Way Patch Panel 19" Rack Panel without connectors - AliExpress
Pro Signal Rack Mount Panel 1U Punched for 6 XLR Connectors - 555-15496: Amazon.com: Industrial & Scientific
Amazon.com: Rack Patch Panel 8 12 16 Way 3 Pole XLR Female Chassis Connnector 1U Flight Case Mount For Professional Loudspeaker Audio Cable (Bundle : 1U-12 way) : Musical Instruments