Here are the nite shots. Seeing them in person they are MUCH brighter. BTW, they DO require a HD flasher to operate. Most 87-91's should have them. Napa Part number is 552...
Pic with just the lights on then pics with the brakes on. Right side is a stock 1157 bulb.
Chris, I hope I don't offend you as it is not my intention. But having worked for NAPA Auto parts For over 7 years I would like to comment on the flasher you mentioned above.
The flasher you mentioned isn't a true heavy duty flasher. In fact it is the same standard flasher that has been used on the majority of the domestic vehicles from the mid 60's thru the early 90's. It operates with a bi-metal strip inside it that as the electricity passes thru it the 2 strips of metal(which are bonded together back to back) heat up and expand at different speeds thus causing it to pull(arc) away from it's contact point inside the housing thus causing the lights to flash. Simple. Lightweight. Ok for regular every day use. But for towing not a good choice as it flashes way too fast and will burn out prematurely.
Attributes:
Style Name:Thermal Flasher
# of Terminals:2 Terminal
Voltage Rating:12 Volt
Features & Benefits:Flashes up to three 32 CP per side plus pilot
six for hazard. Aluminum housing.
DOT Approved:Yes
Amp Capacity:13 amp
Height:1.5
Length:1.375
Additional Contents:Flasher
# of Terminals:2
However, If you want a true heavy duty electronic flasher, NAPA DOES have one available for around $10.00 - $13.99 depending on your location. The part number for it is 502623 Line code is LIT works great and the loud report of the flasher helps remind you that your flasher is still on after you change lanes so you won't look like an idiot going down the highway with your turn signal on. And it can handle towing a trailer with no problems
Item#: LIT502623
Attributes:
Style Name:Electro-mechanical
# of Terminals:2 Terminal
Voltage Rating:12 Volt
Features & Benefits:Features load sound. Uses 1/4" male blade terminals. Double coil relay with electronic components. 60-120 FPM with 1.5 seconds after start up.
DOT Approved:Yes
Amp Capacity:20 amp
Height:1.33
Length:1.35
Additional Contents:Flasher
# of Terminals:2
I hope this helps out guys!!!