I found some OEM cross reference numbers for the HF54050 here :
http://texaspowersteering.com/Steering%20Picture%20Catalog%208-2007.pdf
Search Terms:
D0HZ3504J
[SIZE=+1]
RG54050X
[/SIZE]E0HT3N503JA
casting number : HF542996
and some of the trucks using the HF54050:
Height:
19.5 Length:
9.5 Width:
13.5
1980-1980
Ford Trucks - Medium Duty
LN600
All
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Application Data:[/FONT]w/5,000,7,000 lb. Front Axle
1979-1970
Ford Trucks - Medium Duty
LN600
All
[FONT=arial,helvetica,verdana]
Application Data:[/FONT]Exc. w/9,000 lb. Front Axle
1980-1980
Ford Trucks - Medium Duty
LN700
All
[FONT=arial,helvetica,verdana]
Application Data:[/FONT]w/5,000,7,000 lb. Front Axle
1979-1970
Ford Trucks - Medium Duty
LN700
All
[FONT=arial,helvetica,verdana]
Application Data:[/FONT]w/Exc. 9,000,12,000 lb. Front Axle
1980-1980
Ford Trucks - Medium Duty
LN7000
All
[FONT=arial,helvetica,verdana]
Application Data:[/FONT]w/5,000,7,000 lb. Front Axle
1979-1970
Ford Trucks - Medium Duty
LN7000
All
[FONT=arial,helvetica,verdana]
Application Data:[/FONT]w/Exc. 9,000,12,000 lb. Front Axle
1979-1970
Ford Trucks - Medium Duty
LN750
All
[FONT=arial,helvetica,verdana]
Application Data:[/FONT]Exc. w/9,000 lb. Front Axle