Not to be a smart :censored: , Tom, but to get proper stuff, already to size, try a Stihl dealer. I used the arrestor from my 200T on my 361, and the spark arrestors from grass trimmers littlerally slides out with no tools.
The screen from an 044 is 1118 141 9006, and the screen from the dual port cover is 1128 141 9000. They can't be much more than a couple of bucks each. That's if you want to buy just enough for a couple of saws, and not buy in bulk.
Jeff