The pictures in the parts books are incorrect. If you look up the top cover for the 982 SN# 719999 and down, it lists the top cover (#10) as part number IH-144744-C2. Right below that in the description it lists the dipstick for it. Part number IH-144777-C2. If you look up a 782 serial number 719999 down, same cover it is part # IH-394090-R1. These rear housings are exactly the same. It is the pics on the 982 blowout that are incorrect. I am 100% sure it is not a PO mod. There is a picture of this tube in the owners manual for the 982 on page 14. It is the manual in the tech section, I do not know the service number for the book.
http://ccmanuals.info/pdf/982%20IH%2...s%20Manual.pdf