Hola Class I have been on a " soap box " about the http://www.1aauto.com/1A/ExhaustManifolds/Dodge/PickupFullSize/PLP1390041/67559 exhaust manifolds being a bolt in center dump HP for the 1959 year Imperial to the end of the 1966 year Imperial for some time now. They will fit both sides for a performance improvement. The good part of it is that if one does not advertise the simple change, the others will not notice it at the car show. Oh yeah, the passenger side will accept anything. The 1967 and newer Imperials can have the HP " C - Boby " driver's side exhaust manifolds as a bolt in. The passenger side will accept anything. The driver's for the 1981-83 Crashier Imperial can seek for a set of 360 exhaust manifolds from other MoPar's that share the same body platform. ( For those that are not LA engine guru's will think the 318/ 360 exhaust manifolds are all the same even though the 360 version has a larger exhaust diam. ) And like the other's, the passenger side will accept anything. Rodger & Gabby Colo Spgs '47 De Soto Custom w/Fluid Drive & passenger door mounted swamp cooler '62 Crown Coupe w/std A/C & Auto-Pilot '66 Le Baron w/dual A/C & reverbed AM/FM '70 Overlander - InterNational Dbl '70 W100 w/318, NP 4 Spd, 3:55 & Short Box '77 D150 w/360, NP 4 Spd, 12 Bolt Axle, OEM Buckets & etc ----------------- http://www.imperialclub.com ----------------- This message was sent to you by the Imperial Mailing List. Please reply to mailing-list@xxxxxxxxxxxxxxxx and your response will be shared with everyone. Private messages (and attachments) for the Administrators should be sent to webmaster@xxxxxxxxxxxxxxxx To UN-SUBSCRIBE, go to http://imperialclub.com/unsubscribe.htm