L1 tractors are an oddity and all on their own.
They are what in the USA we call grey market tractors.
For you in Qld they are also grey market because they were never meant to leave Japan.
Most of the L1's do not have operator, service, or parts manuals.
And when you can find them they are in Japanese.
Most of the parts are the same as other Kubota's made at the same time frame.
If you have anything specific you need to know, I might be able to help.