I've already told you enough for YOU to make your own decision there. If you are not willing to slightly alter to fit, your mind should be clear what to do, it's not my bike. The biggest issue is to ask the seller if the system has a crossover pipe joining both L&R halves, that indicated the extra oil pan bolts most of the time.
Your biggest risk is the age of it, the systems rusted like you wouldn't believe even with little use, Honda exhausts are well known for it. It can look beautiful and be junk. I myself will not touch used OEM pipes. I put a header on anything I ever build.