For an 85 Cutlass/442. They're practically everywhere, except the parts catalog.
These are the two bolts/screws that hold down the MAP/Manifold D/P sensor on the fenderwell. The sensor, then cover over that, then two screws hold it on the passenger side plastic fenderwell posts on a Cutlass. Right behind the rad overflow tank.
If you have any, I would so appreciate it if I could purchase them from you. If I had the part number, I'd try to find it myself, but that's part of the issue.
Here's a pic below. They HAVE to be minimum 30mm long due to the thickness of stuff it has to go through just to thread into the mounting posts, but the original screws are 35mm. They have the hi-lo double threads in it because they're going into plastic and were designed not to come loose. I don't know why they used this type when the other mounting screws didn't have the hi-lo threads.
M4.2-1.41 x 35mm (from tip to under the washer) Double Thread SEMS Screws. The hex washer head is 7mm and SEMS captured washer is 12.5mm diameter. It's stupid because the little sensor cover has indentations that allow for the smaller SEMS washer to fit, but if it's a bigger washer, it won't seat properly.
Let me know if you have two. Or even more if you want to let them go. I'm not picky. I found GM p/n 11602875, and 11589012, but they're only 25mm long. The depth of the sensor/cover is 20mm thick, so that leaves 5mm of thread. Which is about 3/16" thereabouts. So you can see it's not much left on those. I don't want to use those, but if I can't find any proper bolts....