The bolt kit with the EcoHitch Hidden Trailer Hitch Receiver # 306-X7221 that fits your 2015 Nissan Leaf includes the following parts.
6-3/8” Flat Washer
4-3/8” Inner Tooth Lock Washer
5-3/8”-16 Flange Nut
1-3/8”-16x1” Hex Cap Bolt
4-3/8”-16x1-1/2” Hex Cap Bolt
4-3/8”D-3/4”x2” Plate Washer
1-3/8” Bolt Fisher view full answer...