I bought mine from a local motorcycle store, you can buy them online, on ebay and similar places, Super Soco has 17" rims that is common on motorcycles as well.

motorcycle rim stickers 17"

More sticker mods, today I got a "3D gel" tank protector sticker in the mailbox, so I changed from the previous one I had cut out in carbon fibre wrap vinyl;

I have Grey and red, I don’t know which to choose! What should I do.

if you match it with more details in the same color as wheels stripes etc in a theme, I would choose red, always nice with a color that accentuates.

Take mine as an example, compare the look when it was delivered new, completely in black - looks gloomy now - compared to it now in my version with some red details!