my 86 kx500 decals came from that place. good, but not thick like the original. i am sure a few rides and my knees will shred them. to make that not happen take clear numberplate background and cover the thin stuff.
mxa or mxm as they are now called still makes decals, i have these for my 94 kx500. they are real decals, not thin jobs
they make them for 500 but not listed on their site. my 94 looks like a 89 other than the showa twin chambers.
http://mxm.co.uk/?page_id=17&category=15&product_id=296again, moto at decal works will make anything you want, any thickness you want. they know what they are doing. they have done a ton of custom junk for me and always were fair and better than oe quality.