Welcome!! Please post more pictures of that TX-7, it looks very very nice!
As for 7" 'universal' tires....they are VERY hard to find in good condition...the 'knobby' tires aren't too bad...but the street/universal tires are extremely hard to get in GOOD condition...I'm sure someone has an old, used set...but probably not new. Good luck!! They are Pirelli SC93.