Finding a GM accessories dealer in Houston that is open on Saturday can be challenging. Sterling McCall Buick GMC, your Houston Buick and GMC dealer, is open on Saturday 8:00 am until 5:00 pm. We are located at 10422 Southwest Fwy Bldg D We feature a nice selection of GM accessories available to all of our great GMC and Buick customers. If you have any questions about which accessory will work best for your vehicle, call Sterling McCall Buick GMC at (888) 672-1730 and a service employee will be happy to answer your question. Your Houston GM dealer wants you to know that Genuine GM Accessories are backed by a 12-month warranty against any manufacturer defects.