I have been trying to find a 3909879 LH exhaust manifold for a long time now and have all but given up. When I try to win one on Ebay, seems like some people think they're made out of gold instead of iron! I have the 3916178 RH. I'm about ready to buy a set of the reproductions from Ricks. What do you guys think about these repops? Do they fit right, how close is the appearance to the originals? Do they have a cracking problem? Any advice or comments would be appreciated.