Steve,
Steele's 70-0145-73 is the door seal - a single piece of seal that goes around the entire door - one piece. As described above, the joint is in the middle of the metal retainer at the bottom of the door. This is shown in the Factory Assemble Manual. There is not a second seal held in place under the retainer at the bottom of the door.
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The other parts from Steele are confusing.
1. 60078-73 - "All Commercial, '55: 1st Series"
This seems to be for 1955 1st series (why the change in early 55???). Does any one reading this have this shape of a seal on their truck?
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2. 60-0313-73 - "Commercial, 55: 1st series"
This seems to be for 1955 1st series (why the change in early 55???). This looks like the lower cab/door windlace that is held to the cab floor under a metal retainer in the door opening (for late 1949 through 1955). Steele's seal is black but the originals might have been gray or light maroon (depending on the year and model of truck).
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Go to the bottom of the page in Steele's catalog (1954 Chevrolet & GMC trucks)) and select the link for your model - the two "questionable" seals above are not listed??
I'd buy the door seals from Steele (or from Classic Parts of America) and the windlace from a repo parts vendor (Jim Carter or Class Parts of America).
Tim
