Check with J.P. Pistons, they should be able to make you a set of assemblys which will include the 0.040 rings... (https://www.norndaautomotive.com.au/jp-pistons/jp-contact-us.html)
They also made a set for my 1925 Rugby and I can attest to their product.
Fortunately for me they are only located 40 minutes away on the other side of the City.
Where Are You From? Adelaide, South Australia
Do You own a car built by Durant? 1925 Rugby Tourer & 2 projects