I ordered a bunch of Treso's from TR. If they didn't have what I wanted in Treso, they'd send a replacement in their hardened stainless steel which costs $.50 more. Same dimensions as Treso's.
I've been happy with both. A little tight for CCI #11's, but they do go on and go off every time. Only had problems getting my capper in there to install caps. TR's nipples are just a tad longer than stock. Otherwise, they're well made and would not hesitate to order more.
Check out TR's website as they also have an application chart and cross references for both their stainless and Treso's. Can't go wrong ordering either or from TR. Service is friendly and shipping quick and if there's a problem, they DO get back to you.
Btw, to save on shipping, ask them to send it 1st class instead of Priority or UPS. They just pack'em up in a bubble envelope and get them on their way. I've ordered from TR twice and both orders cost me less than $2.00 ea for shipping. Way coool! :-)