Hydraboost part #

[m.sayles13]

Hey, wondering if anyone could help me out here.
I've got a 88' gmc dually and need the part # for the hydroboost unit . It's got a 6" brake pedal rod on it but the one the autoparts store gave me is a 5" any help would be appreciated.

 

[chengny]

I show the boost unit as P/N 14055057;

and the applicable rod as P/N 345683.

Those numbers are what are given in the general parts dwg/list:

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And they also agree with the numbers provided in the detailed parts list:

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As far as I can see, the only part that would be specific to a dual wheel rear axle setup (RPO# RO5)is the proportioning combination valve - item 26.