For sale is a Ferrari 308 Brake Booster, Master Cylinder (I believe) with the Original Box. My understanding is that this will fit a Ferrari 308 (GTS/GTV/GT4/Dino). You cannot find any Brake Boosters with an original Ferrari Box. And, this price is the lowest you will find it online w/ master cylinder and original box. Note surface rust. 

If you find a better price, I may just match it. Make an offer. 

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My late father acquired this part for his 1975 Ferrari Dino 308 GTB which he owned for over 30 years. He raced his 1961 Porsche 356B for over 50 years in, among others, the Southern Vintage Racing Association (SVCA) and Historic Sportscar Racing organization. His Dino is pictured above. Each of these parts have been stored in-doors and are sold "as is."