Hello Mike,
I made a mistake with the size of the Indian lettering. The above size information is the lettering "Scout" on the tank of a 1928 101 Scout.
Enclosed are some providers, you may find something suitable.
https://classictransfers.co.uk/?s=Indian&post_type=product
https://pelders.nl/product-categorie/indian/
https://www.vmccshop.net/indian-1-1?pagenumber=2
http://www.abziehbilderservice.de/Start.htm
http://www.paintdoctor.com.au/classic.htm (if it should be painted)
All the best
Matthias