The smog tubes I bought from GM a few yrs ago are anadized but they only had 73-74 for the pass side, and the virtical piece is set back farther and is curved. Not sure if I want to put the 73-74 on cause of the curve. What are these like? Made in China? http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=370280122765&fromMakeTrack=true 330508 - 2-4-6-8 cyls (73-74) 343763 - 1-3-5-7 cyls (they flatten out between cyl 1-3) who are these dumb asses repoping incorrect specs? Doesn't GM check their work? Anyone in Canada replace theirs with new ones and still have their old ones they want to get rid of if they are usable?