OK guys I have been in touch with Cyba, we are not going to be able to get any customized stuff right now but this may fit the needs of many people here. Here are the tips he offers:
http://www.e90post.com/forums/showthread.php?t=237510
Since the have a banked portion that spans from the 57mm inlet to the larger tip diameter, I figure I can slide it into my 3" existing tip and scribe a line onto the new tips so I know where to cut it off and have it fit exactly. So, with a little fabrication, the exhaust tips will really fit on any diameter exhaust. The shop was going to have to weld it on anyways so just adding cutting won't run up the labor cost. You can also get your preferred length by choosing where to cut off your existing tips. I was hoping for a longer length of titanium but I think this will be ok as long as you don't want your tips to stick out too far (then you'd see the rivets).
So this is what I decided to go with- 3.7" Titanium Single Tips with Blue Burn Rolled Edge which are pictured here: