+1 to what Eric said.
Either look for 1/4" x 28 screws/bolts at your local old fashioned hardware store (Home Depot, Lowes, and other big box stores won't have them)
or try searching for them online at Fastenal.com, (or similar places like Grainger, Drillspot, etc)
or try Brownells Remington 700 BDL allen trigger guard screws, part number 084-272-701
http://www.brownells.com/.aspx/pid=1...ERGUARD-SCREWS.
The trigger guard screws have a fillister heads and are available slotted or hex) They are too long (2 1/8" and 1 5/8") but you can easily trim to fit.