Replaced our three-lens OEM Bargman incandescent lights with Bargman's LED direct replacement ASSEMBLIES. I emphasize "assemblies" because the performance of the lights is way better when every part of the lamp is designed to be working with LED.
You say "surface mount." Is that Bargman #86? Ours were #84 recessed, installed in cut-outs. Replacements fit perfectly, right down to the screw holes. Got them from Eastern Marine.
I should add, VERY worthwhile mod/upgrade! We were having problems with both bulbs and sockets. The replacements are hard wired. This takes a little longer but cuts down on problems.
Much more dramatic lighting. There's an intensity that incandescent doesn't have.
LED's are so energy efficient that you may have to add load somewhere to get your flasher to work properly. When I installed our LED lights, they flashed way too fast. There's actually a resistor to help with that. What I did was add an incandescent marker/turn light on mirrors. That put two bulbs and one LED assembly on each side and turn signal came back to normal.
If God's Your Co-Pilot Move Over, jd
2003 Jayco Escapade 31A on 2002 Ford E450 V10 4R100 218" WB