I have a couple of ATMega8's that used to have fuse settings and bootloader to suit 16Mhz crystal. I have attached the bootloader I used but I cannot remember what the fuse settings were of find the forum that discuses them. Here http://www.ngcoders.com/downloads/arduino-atmega8-bootloader-2-second-autoreset/
is a link to another bootloader. I have since re-programmed the chips for internal 8Mhz oscillator use so cannot read fuse settings from them.
You say in your original post these are to be placed in your UNO board. I think the mega8 pinouts are the same as the 328 chip but the architecture is different, not sure if this will cause problems.