These primary guards are beautifully made to fit pre-war Internationals. They fit both the 350 and 500 Model 40 and 30. 
 
They are supplied with a strengthening rib in the top and the rear bracket is separate so you can weld. rivet or bolt it on to suit your bike and get everything fitting just right. They come in primer to stop them going rusty so once you have fitted the second bracket you can paint the completed part black.