Hi Gizmo, and great to see you back at OutdoorKing mate.

What you have there is a Series 2 (twin rail) engine deck machine ( that is erected after December 1975) and is a 14" cutting width, with the Kirby Lauson (Tecumseh) engine fitted.
As you would know, Tecumseh has gone down the gurgler, and parts for the Kirby's are very thin on the ground...but, some members have been having success getting parts from USA...they aren't cheap with the exchange rate of the Aussie dollar...but it all depends on what parts you are chasing and how much you are prepared to spend on the restoration.

Gizmo, you have posted in the correct area, as you intend to restore the machine.
Post Edit: This machine has proved to be a most important find...A twin rail Series 2 SB Model 45, 14" cut, that was delivered in November
1973Read on and view the original receipt.....This is
2 years before I thought the Series 2 machines were introduced!