Old_Pokey
Guest
Yes, the 820 will fit the 1688. Pretty much all headers in the IH line will interchange. The only thing about your cutting wheat with the 20' is how good is the wheat yield. If you're not too pushed for time in the wheat, the 20' will work fine. You may just have to run the machine at a slightly less than full capacity. If your wheat is high yield stuff, the 20' will work great. Good luck with your new purchase and let us know how it works out for you please.