Folks over at TurboBricks say that these do seal up fine, despite the difference at the nipple.

I haven't measured the calipers, but I have been meaning to. There's only one kit listed for all the 870 chassis cars regardless of rotor size.

In addition to swapping out the brake lines, I'm also replacing the control arms that IPD sold me a couple months back (which turned out to be URO junk) so I can ship them back and get my refund.

My frustration is really this: IPD has the reputation for quality stuff, but I keep getting junk from them. Holding tools that bend, gaskets that don't fit, parts in the wrong bags, parts that break two weeks into their lifecycle, and tools and parts arriving without instructions - which I have to find at their site and print at my own expense.

Their customer service and return folks have not made me feel like they are taking these issues seriously. To be fair, they have said they will take the return and give me a refund, but then I get to ship it back at my expense.

If these guys have turned a corner for the worse, then we're all wasting our time and money buying from them. If these are just a series of unfortunate coincidences then it's another matter.