Other sources (e.g. http://www.mbzponton.org/n2awa/valiant.html
) list the long screws for a Valiant as 14" 10-24 thread, along with McMaster-Carr part number 99117A610. Don't know if this was shared with the Ranger or not.
If 8-32 is the correct size, McMaster-Carr has 12" long 8-32 phillips head screws, their part number 99117A380, $10.75 for a pack of 5. Always easier to cut them shorter than to cut them longer :-)
You could also go to your local hardware store, get some threaded rod, and solder acorn nuts on for a screw head.