Take a look at your relays before you buy a replacement. I've got a 2001 ZX3 and much to my surprise, I've a combined relay instead of two individual relays in R18 & R19. I pull the fuse panel down and didn't see what I thought I would.
I looked in my owners manual and sure enough, it says R18 & R19 "May be combined." You can replace this combine with two of the individuals. I tried a single in both ports and it works.