Genuine Gerber 99-660 Tank To Bowl Gasket Kit. This Kit Includes The Gasket, Two Bolts, Two Rubber Washers, , Four Plastic Nuts, Two Rubber Spacers, One Supply Line Nut, And One Supply Line Gasket. Other Numbers For This Item Are G0099660, 0099660, 99660, 99-660. 99-660 is the replacement kit for 99-828 Tank To Bowl Kit For Gerber HET Toilets. Other variances of the part number are G0099828, 99828, 0099828, 99-828.