Anyone know what is the common size wood screw to hold these fasteners to wooden top bows or bodies?
Howard, the usual screw is a nickel plated raised head countersunk screw [read oval head]of 4 or 5 gauge and 1/2 to 3/4" long. They should of course, be slot heads.
Hope this helps.
Allan from down under.
Use an oval head #5 or #6, depending on the screw manufacturer, about 5/8" long See what fits into the holes.
What year of car?
I'd recommend you use stainless steel if the fasteners are nickel.
If brass, use a stainless screw to put "threads" into the wood, then put in your brass screw. Otherwise you may twist your brass screw in two. Don't ask me how I know this...
: ^ )