Not sure I understand for sure what you are looking for; the link below should take you to a tire band marketed by JC Specialty - mine has been restraining tires during inflation for about 19 years.
I haven't seen anyone selling them for kart tires, I build my own last year after Tony's incident.
This is the smallest one I have online for sale https://www.branick.com/product/2010-tire-cage/