Welcome to the site !!
I did a quick Google search and came up with this (they are Polisport and they come in Black , Red , White) , so they are available..
You may try PM'ing Ken the owner here , he should be able to locate you a pair
(click where it says PM send private message)
https://www.crfsonly.com/forum/memberli ... rofile&u=3
Did Ken end up finding a black pair? I would love to get black louvers for the X.
I just looked thru the parts store lists , and i did not see anything , I just did a Google search and did not come up with anything either ...... I guess you could always buy some
Krylon Fusion gloss or matt or satin black spray paint , i have used it on white plastic bike parts like Fork Guards and Disk Covers and it holds up pretty well , if you get hit a lot with rocks and stuff they might need a touch up once in a while , but i found if you clean the part with Alcohol the paint sticks pretty good , i have ridden a whole season without it looking bad , i use Devol guards on both my bikes , (painted black with Krylon Fusion) and they hold up well