Help with old harrow

I enjoy this site but seldom ask for help but here goes.
My brother is trying to repair our grandfather’s old Massey Harris off set disc. There are no name plates, model number, serial number etc. It was bought
new with a M H tractor about 1949 or 50.
It is a 12 disc harrow (6 front and 6 back). The only identification marks are an M H on each of the disc spacers and opposite the letters are the numbers 482-437-M(1 or I) followed by possibly an emblem that he said looks like a uppercase P laying on its side. Disc were probably 22 inch when new. It has a weird axle system that I won’t at this time try to describe.
Any idea of where we might get parts would

I have added pictures. Hope it works. I didn’t take one of the entire axle but the last picture is of one end. The axle goes through the outer shaft and the blades and spacers slip over that shaft. Each blade has a small pin that secures it to the spacer on each side and the entire assembly turns on the axle inside of that housing. I think we can easily have square shaft blades cut to fit the housing. Spacers are another thing. Thanks for responding and sharing this with me.