How do I import back specific contacts from my SD card

I followed a guide online which was offering a way to reduce the size of my contacts file on my HTC Wildfire as I keep reaching 'low space on phone'. It told me to make a note of the specific file when I exported them on to the SD card and then select that file when it came to importing them from the SD card back to the phone. The problem is I can't see that file as an option - only 'Google' or 'Phone' - if I import either I get ALL contacts stored on the data card including every connection on twitter, facebook and G+. I only want to import the address book I sent to the SD card - anyone know how I do that? Thanks so much