Another what year is my BF75 question

[Alumarine]

I'm trying to determine what year and/or serial number range my BF75 long shaft is.
I need to order some maintenance items.

It has CDI and I can't read the serial number.
Here's some pictures. Thanks.

 

[Alumarine]

Read somewhere that the serial number could also be on the front of the block.
Found BF75L 13005xx stamped on the block which means it's a 1981 I think.

Honda serial number to year 20 hp or less
http://www.hondamarine.pl/download/r...i_silnikow.pdf