these wheels are direct-fit replacements engineered to Traxxas factory specifications

4 pieces of track will make up 1/3 of a 18" radius circle

Large — Powerhobby Large Bag

They are backwards compatible the EB/NB/ET/NT48 as well as the SCT410

Arrma AR320275 Bumper Set Composite Rear Senton Short Course Sprint Parts these wheels are direct-fit replacementsArrma AR320275 Bumper Set Composite Rear Senton Short Course OVERVIEW: This high quality Composite Rear Bumper Set provides the perfect replacement for your kit items. FEATURES: Super tough composite material for long lasting durability and increased crash resistance Precision manufactured mounting holes for secure fitting and easy servicing INCLUDES: 1 x Composite Rear Bumper Set per pack