in the circle track world the G bodies are called Metric...as for the upper control arms they are usually sold in sets with a shorter right side so you don't have to use tons of shims to get the chamber you need on a circle track car...I had to order mine to have the stock measurement on each side. It didn't raise the cost at all and the wait was 3 days...The ones that G body parts sell for $129 used to be close around $275 but I think they heard that race shops were selling them for about $60 per so maybe that's why they had to cut their price....