I don't know specifically what they ran for a flasher. Jim Y. might know, since he made a contact out there. You could always use an old Unitrol (like the ones that Daniel just sold on here), since it matches up wth the other equipment. Any brand will work, you just have to be careful to look at the flash rate and don't get anything too new (if that stuff matters to you).
Also, you could always get something like this:
http://cgi.ebay.com/lightbar-accesso...QQcmdZViewItem
And mount it in the glove box with the rest of the equipment. Personally, though, if you are using a switchbox, I'd go with something that mounts underhood:
http://cgi.ebay.com/ebaymotors/SOUND...spagenameZWDVW
You should be able to get a working flasher off of eBay for $10-$20.