Tires for 14x4.5 wheels?
Stock sizes would have included D78. See what cross references to P metric. My recollection is 195/75r14.
In terms of load carrying ability, this sounds right.
The D78 is the follow-on to a 6.95. By cross-section width, the closest tire would be a 175/75-14 in a radial. Usually a tire without a sidewall ratio, in actuality runs about 82. Since the sidewall ratio relates section width to sidewall height, it means that as the ratio increases, the taller the tire will be at a given section width. It also means that tire size increases (by section width), the tire gets taller.
Here is an illustration of how it can work out. Goodyear makes 175 thru 195/70-14 tires. The narrowest rim the 175 can be run on is 4½" wide. On a 5" wide rim, it presents a rolling diameter of 23.7". The same tire at 185/70-14 also has a 4½" rim width minimum, and a rolling diameter of 24.3". It is 0.4" wider at the widest part of the carcass than the 175/70 tire is. According to Goodyear, the 195/70-14 tire is not recommended for a 4½" wide rim. Hope this helps.
You may think that choices are limited. Be glad you're not looking for a 13" tire.