i just checked the website and there is a 5 inch cover listed its 5401. dont know why it didnt show up the otherday
try this link
http://www.kchilites.com/store/Light-Covers-C115.aspxi just tryed a 6 inch cover i have and it doesnt fit too bad on PE light. i will have to get a 5 inch cover and try to see which size fits better. i looked on ebay and there is plenty of 6 inch KC covers, no 5 inch covers.
i was thinking that somone who makes seat covers could also stitch one up. we could also get PE logos printed on them or something. maybe the seat cover guy in NZ could make them. i also thought about getting the yellow KC covers, removing the logos and making some stencils and using spray on vinyl paint and do my own logos.