First, thanks to all of you that have helped me in the past and thanks in advance for those that will offer their wisdom. I have read the multiple threads going back 15 years or more regarding the correct transmission and differential lubricants and admit I am still not clear. I have a stock 1969 1750 Spider Veloce and want to know what contemporary products folks are using. I understood that the recommended trans lube is 75W/90 NS (Not EP) and the differential is 80W/90 or GL5 hypoid. But I can't find Shell Spirax HD which was highly recommended, as an example. I am looking to get the best performance and want to make sure I don't screw something up! I appreciate what advice you can offer. Thank you.