When I worked at the muffler shop we used a piece of muffler pipe to knock that boot on without damage.
I Think Johan did it from a pipe!!
Last Friday I found a company in California called Clips & Fasteners Inc.
They had the right model of wellnut. I'm not sure who I was talking to about these wellnuts but on their website I found a wellnut 10-24. I ordered them on Friday and they showed up here in Tavelsjo out in the sticks in northern Sweden today!!
Theseone are the ones that I needed. They are a little too long but that was solved through taking a longer screw and mount them to the door and then change to the smaller ones. Worked out good but was a little tricky. I can truly recommend them. Super supplier BIG TIME!