Superior to flat speaker Adapter in designed. Similar to MTX Design plus improvements of having triple pre drilled mounting holes. Pre drilled speaker mounting holes will fit most aftermarket speakers. (We have yet to hear of a brand that these speakers do not fit so far) Sold as a pair with installation hardware: 8 bolts & nuts. 100% Satisfaction Guaranteed. If you are not happy email us and we will refund your money including shipping. Please note some models/years may need the area of installation to be trimmed for fitment.