Amazon.com: American Sound Connection Compatible with Chevy C/K Silverado or GMC Sierra Full Size Extended Cab Truck 1988-1998 Dual 10" Subwoofer Sub Box Speaker Enclosure : Electronics
Standard Series Dash Replacement Speaker for 1973-87 Chevrolet C/K Ser – Retro Manufacturing
Chevy Ck Silverado 88-98 Ext Cab Truck 12" Subwoofer Box Speaker Sub Enclosure & Sub Wire Kit - 1X12GMOLD-WKIT