No the bolt pattern is different. You would have to drill some new holes in some of them if the flanges have the room. I could sell you some gen 2 flanges if not but that would be some work to get your old ones off.
thanks- I will keep you in mind not sure which way I will go yet. I have a set of belanger headers I can't use. I may put them up for sale wanted 800obo. I was also looking into this company for a custom set. A bit pricey but its an option Stainless Headers Mfg., Inc. fabricates custom headers in stainless and mild steel