Bree123

It's 60.5" x 5" for the sides. 48.5 + 4.5 + 4.5 = 57.5" x 5" for the top & bottom.


For bias borders:
You need to add 2 x finished width of border (4.5")
60.5 + (2 x 4.5) = 69.5 + .5" for seam allowance, so 70 x 5" for sides

48.5 + (2 x 4.5) = 57.5 + .5" for seam allowance, so 58 x 5" for top & bottom

EDIT: I am assuming you are not super concerned about each border having all pieces exactly 4.5".