the reason they don't fit is the location of the radiator....they are different between a pinto & xflow
when you put a pinto into a xflow body you need to cut the radiator support at the top and also cut a recess section into the bottom - a pinto is a lot longer that a xflow (I have done this a few times......)
found this old pic....shows how the radiator is 'recessed' into the radiator support panel...is yours the same?
Have a look at your car taking note of where the radiator sits and where the brackets are and then compare tp the pic above - better still take a pic of yours so we can help out
if yours is sitting where a pinto one sits someone may have already modified the body to suit????
take a pic and we will be able to work it out easily