Welcome.
I don't think that repros are made. You might check if Numrich(Gun Parts Corp) has any used ones.Ebay might have one from time to time,but some sellers won't ship outside of the US and ebay blocks sales of certain items( I tried to sell a scope recently-no luck),plus their Global shipping plan is expensive.
I actually think that you'd be better off with having someone in Oz duplicate your stock.

 

Numrich doesn't have any under that model, do you know if the model 60a shared the stock with any other rifles?

 

Can't help with a parts source up here that's willing to ship overseas. Called a couple of my cobbers about parts without any luck. Here's a short M60 blip you might find interesting in the meantime.
http://outdoorchannel.com/article.aspx?id=28933

"In 1934, Winchester added a wing-type safety, made the bolt handle a little larger, went back to a walnut stock and renamed it the Model 67, which stayed in production through 1963."

 

I believe a model 67 stock will fit. It is no the same but will work until you find the right one. Have a great day. Jay

 

Welcome to RFC!

Gunville. com advertises a stock for the Win 60A - I have no idea if they can, or will, ship down under.

http://gunville.com/shopping.html

 

Alternative:

Get a piece of dark walnut. Make a yellow shape about like what the three blue data points represent. Straight lines for a flat triangle. With the right-left right thickness. Remove stock wood forming straight flat surfaces to make a base to epoxy the yellow shape into. Shape the edges of the yellow insert as needed.

Using the data points to form a patch is easier than trying to shape stock curves and then match with shaping the patch. Make a easy shape patch and then fit it into the stock.

Minor patch. Done all the time with military rifles. See “Lithgow Factory Through Repair FTR.