Front sights on the BDL's did include a hood. Shouldn't be hard to replace. You might want to check with a few local gunsmiths as they may have some parts sitting around.
Also could check with Remington.
Two other sources come to mind. The first, Numrich, may have your parts in stock. Or, you could call Williams Gun Sight Co.
They make replacement front sights for many rifles. Be sure to specify forRem.700 (remington hole spacing).
Links:
Numrich:
http://www.e-gunparts.com/
Williams:
http://www.williamsgunsight.com/