3157 Betts Flush Mount
Flush mount *WIDE BASE*  is 3.5" OD
Flush mount  *NARROW BASE* is 3.1875" OD
Both designs will mount up in place of standard watermelons
Requires 2" center hole for 3157 plug.
Requires two 3/16 holes drilled horizontal on 3" centers.
*Bulb not included on flush mounts
Sold as each.