There's a holder for each bulb which twist-locks into the flasher housing. Thought the task was simple, just install and connect, and ran into the first problem.

I didn't realise that the front bulb and holder on the Concours is not horizontal when installed in its reflector housing, it's aimed more like 20 deg upwards. With the incandescent bulbs, this is no problem, light is emitted in pretty well all directions. With LEDs, most of the illumination is along the bulb axis, so birds and low flying planes would see these new LED running lights/turn signals, but cars in front of the Concours wouldn't see much.

The solution was to break away the plastic housing around the LEDs, bend the LED array down 20 deg on its leads, and reinforce the new position with hot-melt glue. Installed, tested, now works like a charm. Placing and twisting the bulb holder into place is challenging for those large of hand. At least now they're slightly easier to insert without the plastic cowl on the bulb.

The front ones worked out so well, I installed a couple of 35-LED 1157s in the tail light. Each bulb has 19 LEDs on axis facing back, and 16 firing radially to bounce off the reflectors. Compared side by side with the incandescent, they seem fine.

Current draw is 25 ma plus 90 ma when braking, each bulb. $12.40 US a pair from eBay , including shipping.