where can you find the metal j-hook that bolts onto the wiper arm for a 89 pickup ?

highway

 

Try the dealer.

:wabbit2:

 

ive seen em on fleabay also...

 

You're looking for ANCO part# 4808. This is what I needed for my 86 pickup to use off the shelf replacement wipers. It took me forever to find this. Windshield wiper companies don't seem to include these accessory kits anymore.