Hi John
I can't remember where I got mine from as they were bought by my son for his RC 1:10 ages ago. However, there are some identical on ebay, they are advertised as green but I am sure there are other colours as well if you contact the seller.
The link is
http://www.ebay.co.uk/itm/RC-Neon-Un...item27c3f2ac0b
or seacrh ebay on item number 170791185419
John