So, any tried these LED bulbs?

https://blinglights.com/mazda-miata-mx-5-custom-led-tail-lamps-light-bulbs-nc-nb-na/

every thing is telling me to run, but my curiosity is getting the best of me. Anyone tried it?

You need to try the in the interest of science, and report back!

I have not tried the Spiders but have tried a few of the different LED's.  My general impression is they have a life cycle closer to hot incandescent bulbs but are as good or better than HID's and much cheaper.  The three things to watch out for are adjustability (rotation to address cutoff for headlights), pattern spread, and built in resistors (they draw so much less energy they fool the system into thinking a bulb is out without an inline resistor)

No personal experience with those but I was looking at those style bulbs for a previous vehicle. A few things I found from the reviews:

The arms are pretty fragile. You may get them into the housing OK but if you have to remove them, the hinge may break.

Poor lighting. Most modern light assemblies utilize a very complex reflector to reflect the light out of the lense. When you change the bulb shape, you also change the source of the light. It looks like these bulbs put more light straight out the back of the housing, which may end up making them dimmer than a standard halogen bulb.

I really like LED replacement bulbs. When I'm looking at replacing the incandescent bulbs, I try to match the shape and light emission pattern of the stock bulb. That way the reflector still does a good job of capturing the light and reflecting it out the lense.

In reply to stanger_mussle :

Of note, do we need an inline resistor when using led bulbs for brake lights? Or is it just for turn signals freak out?

many brake lights use the same circuit as the turn signals , 

There are special blinker boxes made just for LEDs

In reply to Junghole :

If it is a combination brake/signal, then you will most likely need inline resistors.

My 2010 Forte has separate lamps for brake and rear turn signals. It also has repeaters on the side mirrors. When I bought the car almost 50% of the exterior bulbs were blown. I decided to upgrade everything to LEDs. Well, the car hated LEDs in all lamps except for the little repeaters on the side mirrors. I even bought an "electronic" signal relay made specifically for low current LEDs. It made zero difference and still had hyper flash.

Fast forward 3 years and I discovered adjustable signal relays are a thing. I found this adjustable EP34 relay. Once again, I swapped out all of the turn signal bulbs to LEDs. I had to trim some plastic around the signal relay socket to get it to fit since that relay is a bit bigger than the stock one. I was able to slow the flashing down to stock speed just by adjusting the knob.

I don't know what size signal relay the NC uses but I feel it works better than having to put inline resistors on every bulb.