Arisaka 38 trainer bolt.

A friend discovered his father in law's type 38 trainer he brought back from the PTO while cleaning out his home after his recent passing.
The father in laws kids remember playing with it as children (which explains the missing bolt).
I have cleaned it up and replaced some missing small parts. If anyone has a spare or knows a source for one, I would like to purchase it before I return it to the family.
Any help would be greatly appreciated.

UPDATE
I found a parts rifle hoping the bolt would fit but alas no joy.
The bolt on the parts rifle (type 38) had a guiding lug recess in the receiver at the 12 o'clock position while my patient (type 38) has the guiding lug at the 9 o'clock position.
At least now I know what I am looking for.