Good to see an inexpensive solution. I tried the following linked JDM AStar LED's ($16.95/pair) in my CHMSL and reverse lights:
Buy JDM ASTAR Extremely Bright 144-EX Chipsets 7440 7441 7443 7444 992 White LED Bulbs with Projector For Backup Reverse Lights: Back Up Light Assemblies - Amazon.com ✓ FREE DELIVERY possible on eligible purchases
www.amazon.com
They work as reverse lights, although I could still use something brighter (have 20% tint applied to back window).
However, the left CHMSL bulb does go on and off by itself while the right bulb stays on steady. Doesn't affect anything, just looks funny when it happens.
May switch over to new ones at some point.