If your search fails to find what you desire, there is another way to obtain what you want.
Just about any local vinyl sign shop should be able to measure/photograph the current lettering and create, in the same (or very similar) font and size, an entirely new center text section for the stripe decals you currently have.
Carefully remove the existing center stripes and "PANTERA" and replace with the new vinyl lettering.
Or just have a complete new one made and remove all the existing one.
Custom signage like this is really not that expensive. Consider what your purchase price would be if you find one in the USA, add your import and VAT taxes.....
Paying some local bloke to make what you want will also keep those GBP from leaving the Motherland.