What it is
The part in question is the plastic shroud above the tailpipe, which is bonded to the mesh in the rear clam. It is a common problem: it "usually quickly departs the rear of most VX220s". One member thought it was just cosmetic, there to hide the mangled mesh. Another said the expensive replacement sold by Eltech offers no heat shielding at all, so members don't agree on whether it protects anything or just covers the mesh.
If you mean a different heat shield, heat wrap has been suggested for the one in the left rear wheel arch, and works fine. That is a different part. There is more on heat protection near the exhaust in the post-cat lambda sensor guide.
Option 1: refit the original
One member asked how Tiger Seal holds up for sticking the original back on. It was fine on the author's car while he had it, but he sold the car about four months later, so he couldn't say how long it lasts, and suggested a heat-resistant black adhesive instead (he edited his guide to say so). Black silicone had lasted 8 years so far for another owner (a 2013 post).
Option 2: make a replacement from a can
In 2012 the author made his own because his had long since dropped off, he didn't want to pay for one of the "over priced" replacements, and he didn't fancy fitting one while struggling underneath the car or removing the whole rear clam. He says it is really easy and improves the look of the rear end. You need:
- An appropriately sized can, preferably empty
- Sharp scissors or a knife
- A metal file or rotary tool
- Heat-proof paint
- Black heat-resistant PU adhesive
His album had 11 steps with descriptions. The thread doesn't include them, so we don't know how he cut and shaped the can, or how he fitted it.
Option 3: buy one
A replacement from Eltech was on their Facebook page at about 40 euros in 2015, and you could make something similar if that is too much. One member asked whether they could make one marked VX220 instead of "Speedster". The comment about heat shielding is above.