Off the shelf - tan, 24$-28$ vairous sizes... check their tire size charts.
https://tirecovers.com/plain-t...pare-tire-cover.html
https://www.allthingsjeep.com/...tEAQYASABEgJdrPD_BwE
http://www.tirecoversplus.com/plain-tire-covers
I just Googled tan spare tire covers... many listings available.
cheers