i thought that to be true also...about 8 years ago a budy and i went to look at an 81 fj40...rotted bad...in a guys driveway...not moved in YEARS.
an old lady answered the door... in her 70's...we asked if the truck was for sale...she said it was not but she would ask her husband...we asked if we could take a look at it...she said sure.
my buddy called a short time later to find he didnt want to sell it .
when we looked and were laughing how bad the rust was in such a short time we were very happy to see oem power steering, a great floor mat front and rear...rear seats that were MINT...a toyota tool bag...in a thin green plastic document holder was an oem owners manual and oem emissions manual...a plug-in toyota mini drop light (still in wrapper)...and also still in wrapper door straps and the hinge bars.
I was VERY surprised to see all of it...now it could have been not standard...it may have been an option...i don't know
But...they may have still come in every year...we'll have to find some original owners