Buy vinyl tolex covered #guitarcab according to your needing, don't need pay extra money for additional tolex.
Most 1x10 or 1x12 #guitarcab :72x18" add back panel
*Most 2x12 combos : 18X108" add 24"x36" for back panel.
*Most 4x12 cabinets :144X18", 36"x36" piece for back panel

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https://www.ebay.com/itm/27314178364...84.m1555.l2649