I've got my old muffler off and a new Ansa ready to go on. Trouble is the old one is bigger, and looks like someone may have bent things a little to make it fit. The new one seems right, but I can't quite figure out which way the flange mounts to the cat; in other words, I can spin it on its horizontal axis and there are three ways it could mount. I'd like to find the right way and then try to get it mounted that way, maybe letting it run for a while to heat up the pipes, soften things up, and try to gently get in in place right. 

So where should the flange be? Closer to the top of the van, sort of diagonally pointed down to the rear, or what? 

I also notice that the new one is different on the cat end than on the tail pipe end. I think that the cat end has wider bolt holes, and the tail pipe has smaller, threaded holes. Is this right?

Thanks,
Ed in CT trying to get ready for a trip.