Hero wrote:

Sorry I'm still very new to cars in general.

Is the dimension of my 5 speed manual shift knob M12 x 1.25?

Yep! Metric thread dimensions are that the diameter is M12 (12 mm), and the pitch (distance between each thread) is a fine pitch 1.25 mm. All 5-speed manual Subarus use this thread on the shift lever, and 4-speed autos used a slightly smaller M10 X 1.25.

Thanks for this thread folks! People act like it’s easy to find info (spent a lot of time searching even with a service manual to get both threads) and you made it handy! Thanks 😁