The mixture of bias-ply and radial tires may be a part of your problem. It is not a good idea to mix them. To keep the same wheel covers, you will need to keep the 13" wheels.
There are some specialty aftermarket wheels available with the 4 bolt pattern - some in a 14" which are easier to get tires for.
I think that some MG wheels have the 4 bolt pattern - but they don't look very good (my opinion).
13" tires are available in blackwall a variety of places. Often specified as trailer tires. Whitewall 13" tires are available from some of the specialty tire dealers like Diamondback and Coker, but they are expensive.
I was able to buy the remaining WW stock from a dealer, so I have tires for my cars. I do have a set (4) of 175r80-13 WW that I will sell at a reasonable price.
dave-TX
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