Chevy Duty also sells this spring.
http://www.classicparts.com/prodinfo.asp?number=18-575

47-51
(1947-51) Door Latch Spring
Door Latch Spring
47-51

Quantity

Price: $4.95
Part # : 18-575
Year : 47-51

Ships:

Product Description

Large coil spring fits on door latch to prevent outside door handles from sagging.



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~Jim