If you clear them, just use a red bulb or red led. Mine came with amber 194 bulb, I thought about seeing if I could just change the lens out but I dont think that is possible without ruining them. I love the look so I may tackle it again. Once I am done with my tail lights, I have too many projects going on now. A serach on this forum brings up this
thread that has 2 links to the lens.
Gotta love that search function!!!