I've procured a reasonble 1983 van with a 1y conversion, or so I thought

My father and I have started to finish the jobs that somebody had already started, one of which was swapping the exhaust. Now that we've had her up on stands we can see that the original CS exhaust manifold has been used but 2 bolts of the flange were considered 'unnecessary'. Then it was discovered that the flange itself had split.
So, new manifold necessary. Now, the only problem is finding another manifold that will suit the lovely new CS downpipe that I have purchased from JK. I'm struggling finding a CS manifold, so.......can I use any others without serious fabrication?
Or does anyone have a CS manifold I can purchase?