I agree but I really think Rinehart is going to tell me to "pound sand" and explain that it is not their fault if I am not using the factory O2 sensors.
C.O., I certainly understand your frustration. Have "been there and done that" on more car and bike projects over the years than sanity suggests should make sense. The responsibility of bring all the various parts of an upgrade job together though really is ours.
If a vendor has a simple solution or is willing to offer a different part just to see if it makes a difference that is great. That is an excellent vendor to work with and stay with. However......
We know that everyone makes parts from the "stock" template. Period. That is really all they can do. So when we start bringing together disparate pieces from different vendors, and some of those pieces are specifically not "stock" we have to know beforehand that we're taking it on ourselves to bring it all together.
Every 19 year old making his beloved hot rod run (again) for the date Saturday night knows this. As we get older we sometimes tend to forget it though. Zippers might be a slightly more additive part of the problem if they knew the sensors were larger/longer/wider/whatever than stock, that this might cause clearance issues with some known combinations, and they don't make that known before the fact. But even in there it's not on them, not really; at least not much.
We add a different ignition system from one source (that most other third party vendors really won't have ever seen before), pipes from yet another source, all worked around whatever other changes and choices we might be making (then, before or later). Those really are significant alterations. And we really do have to accept the responsibility for bringing it all together.
Don't get me wrong. The vendors should help with whatever expertise, guidance and experience they might be able to bring to the plate. But it's our bike and our choices of combinations.
I personally had some squirrely (but minor) variations in cable routing and harness routing with my Zippers parts that were different then they'd run in to before. I mentioned it to them so they'd have it in the knowlege base in case it ever came up again. But making it all route and work was on me. As was installing the bungs in an appropriate place and doing the rest of the install.
I did have issues with Zippers, but no issue at all with the fact that things didn't fit as per factory original specs. After all, by my choice it wasn't factory any more. So bringing it all together at the end was on me.