Pneumatic Belt File Sander - Which One?

I ordered an electric Wen off Amazon a few days ago because I needed a cheap one quick for sanding fiberglass on the inside of a hood scoop I am reconfiguring.

The scoop originally only had a 2-1/4" vertical height opening and I thought it would be much nicer with 3-1/4" height.

https://www.amazon.com/dp/B072Q2FTLY?tag=fabo03-20

Still plan to buy a quality pneumatic unit, but I don't mind getting fiberglass dust all over a $36 tool.

Tom