Im after a oil pump gear for my h22 but I have recently found out there are 2 sizes. How can I go about finding out the size of my pump gear from the spec of my engine? (my engine is at a workshop and I am unable to measure it)

My engine is a h22a Jap Spec closed deck 1994. Is anyone in the know when it comes to this?

Thanks

 

Bump for some help