This ACDelco Professional control arm and ball joint assembly with part number 45D1037 fits BMW E34 5 series vehicles and is designed for the upper left front position. Made with high-quality steel material, it comes with a nut and has no cotter pin hole. It has an accuracy of fit of 100% and is easy to replace. This product has interchange part numbers of CMK9924, RK9924, K9925, and 89000790, as well as OE/OEM part numbers of 31121132159 and 31121141098. It weighs 6 lbs and is not a vintage or performance part. The mounting style is bolt-on and it is not a universal fitment. This control arm and ball joint assembly is a perfect replacement for your BMW E34 5 series vehicle. Exact item is shown. This is a new open box item. Includes ball joint assembly and nut. No returns if installed or if pieces are missing. Please review our business policies in our store for information regarding returns, shipping and warranties.