Bill, I think I have a couple of old Airfix Spit MkV trop filters in one of my spares boxes if you want one. It should fit reasonably well, but may need a bit of filler here and there. Let me know if you want it.
BTW, the DH prop had a different spinner to the more pointed Rotol prop spinner in the kit. I may have one, which again is yours if you want it, otherwise you'd need to use an aftermarket prop.