That's what I meant by "filters", the OEM overlays with red, yellow, blue etc. where the OD, turn indicators, etc show through.
I tried to read the lettering printed on those OEM bulbs, but even with a magnifying glass it's too dang small for me to see.
I'm not sure what the standard size would be for these tiny bulb bases... maybe a T5?
I've seen some single-inverted cone plug-in LED's with a T5 base on evilbay, but I wasn't sure if they'd fit these little bulb holders.
You could probably use 3x 3mm LED's in place of the single 5mm LED's, it's just a bit more work... and the 5mm LED's look pretty good to me.
My modded 5mm LED's didn't take that long to solder in, although now I'm probably going to swap the white for colored LED's... unless someone wants the ones I have made up.