Chevrolet 1533X2 30-cwt trucks

[Lynn Eades]

Gentlemen, it seems to me, that the answer can be determined from the parts list posted by Phill.
Do we know the series of the truck?
Do we know the year it was built?
Who has the steel mounting brackets, and what part numbers if any are on them?
The one in Phill's drawing showing the bushing and washer is a #602787 this number does not appear in the other list which mostly identifies (earlier?) numbers in the 59xxxx range.
Is the 602787 one, an improved (stronger?) model?

Andrew, yes, the spring and steel mount is the CMP style (I recall someone posted about the way the bolt is fitted)
As David states. this arrangement can be used, with no harm done, and if more info comes to light later, then so be it.