So from here can you determine what generation it is?
Check the body plates and look for engine stamps etc?
Here is a good source for manuals, not sure if it covers your generation;
Daihatsu Hijet Workshop Manual.rar
This website is simple to join (just need an email) lists many generations of Hijet and is an invaluable tool for finding specific part numbers via pop-out technical diagrams and can often list Japanese suppliers for those parts; https://partsfan.com/daihatsu/jp/
