T-16E2 information

[BCA]

Today I found, inserted into a copy of the G-166 ORD 9 Service Parts Catalogue several update pages including one describing the T-16 being elongated and referred to as T-16E2 beginning with Job #A-13462 and Hull #13462. The inserted pages are typewritten and undated.
Also usual term used is "T-16" rather than "T16". There is a mixture of these terms used in the Service Parts Catalogue. I haven't checked other sources like th maintenance manual to get a consensus on which is correct.
Brian