No matter the condition of your 1975 Eldorado, OPGI has the Differential & Rear-End Components you need to boost performance and get you back on the road. We currently carry eighteen Differential & Rear-End Components to choose from for your 1975 Eldorado, and our Price Match Guaranteed prices range from as little as $6.99 up to $279.99. OPGI offers Prothane plus three other trusted brands of Differential & Rear-End Components for your 1975 Eldorado, to help you find quality parts you can rely on. With OPGI's 45-day return policy and thousands of customer reviews, you can shop with the utmost confidence. Enjoy parts delivered directly to your home, or visit our sunny Southern California Showroom & Warehouse to check out our Differential & Rear-End Components in person.