Yep, I meant bipolar LED's only. If you reverse polarity on a normal LED it won't work.

Also here ya go for the ultra bright blue

https://www.jameco.com/cgi-bin/ncomm...s=503;522;711;

and this one is a red / green bipolar that is 5mm

https://www.jameco.com/cgi-bin/ncomm...s=503;522;711;

I had noticed the one you were looking at was 3mm in size.