The OE Porsche oil bridge is susceptible to leaking due to its plastic construction. Our oil bridge machined from 6061 aluminum is a direct replacement for P/N’s 99310708800 and 96410708803. All aluminum construction ensures equal expansion with your all-aluminum Porsche engine. Made in the USA right here in Momence, IL. Sold individually- quantity two (2) needed per engine. Includes o-ring 99970728840.