The hardest thing to find for a K3 will be the chassis and center universals. I think King Headz is still making the shock towers and Kyosho sells either the K3 arms or the 7.5 RTR arms. I believe the 777 arms will work though. The front upper arms may also be tough to find. Kyosho may still be selling these parts though. Email or call Kyosho America and find out.