not a guarantee but www.classicindustries.com has a myriad of small parts (& other parts). If you make a small purchase from them (online) then several weeks later their comprehensive Mopar specific pricey catalogue will arrive in your mailbox unannounced for free & it is a treasure trove of pics etc (a reference manual). you can purchase that first item (maybe bulbs) online.
Not very well. Mine will dim slightly then just completely black out. If I had to guess, I'd say that I have control over brightness between 9-12 bolts but below 9v the leds just cut out
Doug, I bought mine prepackaged from Herb's Parts. I only needed 4 for my E-body Rallye dash and I believe there was 9 in the pack, for 23.00. A little pricey, but they work great, and are fully dim-able thru the full range of motion on the dimmer switch.
They come prepackaged for certain ranges of years for different bodies, A, B, E etc.
Superbrightleds.com is who I used. It's a one-size-fits-all for that type socket. There is a database on their site that tells you what you need. I used them. They dim ok. They have fantastic customer service and you can return anything.
FYI, for rear taillight/brake lights. The best is LEDTRONICS.
I like superbrightleds for my 12v bulbs. You factory service manual will tell you what number bulbs are in the various places in your car, then you can cross them on their site.