They are interchangeable. If you search for pics, you can see that it is just styling differences between them. I believe that the 57 & 58 were the same and then different one's for 59 and 60.
Check out CJ's site in the gallery. There is a Gold 59 that has a 58 grill in it. Looks good and fits well.
Hi, there's definetly a difference between the two years but I'm sure they will interchnge. I like the 57 -58 hoods better, they have nicer lines and a smooth front surface as oppossed to the 59 -60 hoods with front slotted openings and only two lines on the top surface.
57-58 are the same shape other than the holes for the side emblems, 59 is one year only and 60 is one year only, they all fit 57-60