I have lost the orange endcap, but otherwise this diagonal is near-mint. When not in use, I cover the open end with Saran wrap so there is very little dust on the mirror. Comes with 2"-1.25" adapter on other side, and that does have a cap. This is the setscrew type, not the brass compression ring version.
$195 shipped, or $200 shipped with Paypal, to USA or Canada. I take any form of payment. Will do international for $10 more.