I had wanted to do this conversion for some time. I ordered one red (for the brake light) and four amber LEDs from hdbright.com last November, along with an HID conversion kit for the headlight. The red LED and conversion kit arrived in good order, but the ambers were back-ordered. The red LED as a brake/running light works quite well.
Unfortunately, I cannot recommend hdbright.com as a vendor. First, my emails about the back-order were ignored or sent to /dev/null; second, despite their recommendation, the HID conversion kit does not work for my 2006 Buddy, though I think it may work for a 2007 or newer; third, the amber LEDs do not fit properly in the rear turn signal sockets. They will go in and make contact, but the twist-lock is not possible. I think the bottom-most flange is responsible.
I am considering ordering more 1156 replacement LEDs from superbrightleds.com:
http://www.superbrightleds.com/moreinfo ... d/805/748/
http://www.superbrightleds.com/moreinfo ... d/807/742/
On the up side, the LEDs from hdbright.com are good quality. The construction is all metal, with the flanges acting as a heat sink. The six LEDs on each unit are also much, much brighter than the truly poor stock bulbs, and are brighter than a standard 1156, to which I had upgraded a few years ago.
One problem I ran into was the inability to extract the 1156 from the front upper turn signal sockets. The left 1156 is stuck in the socket, and now the replacement LED is stuck in the right socket. I think this is due to poor design. The socket seems to be designed for a bulb with retaining nubs offset at some odd angle (165 degrees?) rather than 180 degrees. Ah, well.
edit: The upper front signals apparently use a BAU15s fitment (7507) rather than BA15s (1156). See
http://www.autolumination.com/images/au ... 15s_wm.jpg vs.
http://www.autolumination.com/images/au ... 15s_wm.jpg
A thought I have regarding the solid state flasher relay: You could avoid this expense by faking out the system with resistance similar to that provided by non-LED bulbs. Measured resistance of an 1156 incandescent bulb is around 0.8 ohms, so inserting 1-2 ohm resistors into the left and right circuits should do the trick. I've been wanting to ditch the upper turn signals, so removing the assembly and putting a resistor in place may be the way I go with this.
You could also, as has been suggested above, leave one incandescent bulb in place. In my case, the rear turn signal bulbs provide sufficient resistance so the relay flashes at a reasonable pace.
The overall design of the Buddy is well suited to an LED upgrade. Sleek and modern, the lines speak high-tech. I often think I am in a
Jetsons episode as I cruise on down the road. The instant-on simply adds to this effect and, key to long life, gets the attention of others who may be using your road.
