The phrase "extra kit" refers to additional or spare equipment or tools that someone carries or has available, usually to be prepared for unexpected situations or emergencies. Full definition
Extra kit includes a rear view camera, auto headlights and rear parking sensors. (motoring.com.au)
This adds front sports seats with a part - leather finish and extra kit on board. (autoexpress.co.uk)
The list of extra kit includes a TRD exhaust, 16 - inch wheels with BFGoodrich off - road rubber, special off - road Eibach springs and Bilstein shocks, and plenty of visual upgrades like a front skid plate and a special Toyota badge on the grille along with TRD Pro floor mats and shift knobs inside. (automobilemag.com)