There were two or three different versions of header pipes and manifolds for both European and U.S. models, which gives us a total of 4-6 different versions combined......assuming you have a V-8 model. The 6 cylinder versions add even more possibilities to the equation. The European versions used male to female connections with aluminum sealing rings, as did the early U.S. versions. The late models with catalyst used a flared flange that did not require any seal. To my knowledge these flanges for the header pipes aren't available separately. You'll have to buy/find the header pipes that mate up to the manifolds. Also, if you're using Euro header pipes you'll have to also install Euro manifolds.....at least on the right side on U.S. versions. The only difference between the Euro and U.S. left side manifold on the V-8 is the addition of the EGR valve. The later the model the more important this is. In addition, you'll have to use different heat shields, as the Euro and U.S. versions had different heat shields that were mounted in different locations.