I made my own after doing a little research on the font and size. What I came up with looks pretty good for what I have in it. I re-purposed some foam packing or pad that came in one of the boxes of many parts I've acquired or had restored so you may already have some. I printed out the actual number to scale using a font I found I downloaded using Word. I then cut the numbers out and placed them onto the foam, traced it then cut them out, then glued it onto a piece of cardboard. Walmart has a great selection of acrylic paints comparing it to my researched photos I came up with "Cool Blue".

If this is the route you'd like to consider just let me know. You can send me the number you need and I can create the doc and send to you ready to be cut out.