Maybe the one for the Ferguson boom crane was made out of steel but I did find a post and John(UK) was talking about those brackets. These are his words I copied and pasted.
I should have said in that last email that the top link bracket will need to be that cast type that is in the parts Book as I think the one shown in the earlier picture is not as long so it will pull the mower forward at the top. BUT if you can't find one of the original type (advertise for one of the Ford section) then you could make one up fairly easily as it isn't complicated and easy enough to weld together.John
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