get the e700X number from it. Then search for "cookieroe"s post on the difference between the OEM NAVs. There is a 4th and a 5th gen NAV (has nothing to do with the gen of 4runner).
IIRC, the e7007,8,9 are the ones you want. the e7008 has the amber lights that match up to the OEM toyota lights. i did swap the LEDs in cookieroe's e7009 unit to match the OEM color, so that can be done.
having been looking into OEM navs myself, you are probably looking at a e7006 unit, which is a 4th gen NAV unit if i understand it correctly.