The Briggs B321606 Tank To Bowl Hardware Kit comes complete. However, It does not come with the tank to bowl gasket. It does have the two bolts and nuts. Also the washers for the bolts. Therefore you can connect the tank to the bowl. The bolt caps are also in the kit. Which cover the bolts on the floor. 

The bolt caps that come with this kit come with the tops and the base. The bolt caps and bases are plastic. They are also in a white finish. The bolts, nuts, and washers are all metal. Therefore they will last longer. Also this kit comes with the two rubber stops. Which go in between the tank and bowl to prevent them from hitting. 

In conclusion this kit comes complete. The B321606 Tank To Bowl Hardware Kit comes with two plastic bolt caps. Also the bases are in this kit. It has two bolts, which are metal. Along with the nuts and washers. All of the parts in this kit are genuine. Therefore These are the genuine parts for tanks number 4470 and 4472. 

• Genuine Briggs Parts
• two rubber stops to protect tank
• bolt caps
• Bolt cap bases
• Bolts
• Nuts
• Washers