It is not discontinued. I just typed that PN into the site and didn't see that it was discoed. Sorry if you were mislead.
There is about 15 of them in the country at the moment.
How much for the check valve vacuum hose and the inspection cover?
MD706012 is $1.84.
Just a tip in case you are looking for a price on something and we aren't around. You can plug your Mitsu PN right into our OEM parts catalog and get a price 24/7