Q: printing greeting cards with 7" width & 5" height

I print photos on greeting cards with specific dimensions: each greeting card is 7 inches in width & 10 inches in height; each is scored in the middle allowing me to print 2 (5x7") photos per card. Whenever a photo is printed it is not in a landscape mode. It seems to me that Aperture is defaulted to print 5x7" photos with the width being 5" & the height 7". I place the greeting card into the printer with the width being 7" & the height 5" with the orientation being in the portrait mode. To date, I have had no luck printing a photo with the correct orientation on the greeting card.