Here is a link to the “standard generic” image: http://download1.dd-wrt.com/dd-wrtv2/downloads/others/eko/BrainSlayer-V24-preSP2/2013/07-24-2013-r22118/broadcom/dd-wrt.v24_std_generic.bin
This image is broadcom chipset, which your WRT54GL is. Be sure you check the upgrade requirements, flashing the router is your responsibility.