The only 16 x 1 3/4 S-7 tires I have seen are black or black white wall.
I believe the only way to get a different color tire is to purchase 16 x 1 .75 wheels off Amazon.
* The colored tires are 16 x 2.125, they will fit the 1.75 rim. The problem I see is the tire's width is 2.125 inches. That might fit in the frame, but I dont think it will clear the fenders. Also you will need to purchase rim strips ( or use electrical tape) and inner tubes.
IMO , I think i.d. go the whitewall 16 x 1 3/4 tires.(+ new inner tube and rim strip).
Post a pic when you get done with it