Wanted: Old 16" tires wanted for a hay wagon (6.50 16 replacements)

I am looking for 4 old tires to replace some "6.50 16" tires on a hay wagon. They do not need tread, but rubber must be good (not rotten). Total diameter should be around 27-28". I think the following modern sizes might work:

175/80R16 195/75R16 205/65R16 205/70R16 215/65R16 215/70R16