im finding parts for my 75 tradesman van (base model ) w/225 slant 6 ...choke assist resister and electronic speed switch among other parts... but the part numbers are different but very similar .. example...speed switch found 3874210 part but mopar book # says 3874128 or 3874129 ...choke assist # found 3656730 ...cant find this item in my mopar parts book....are these parts that different or are the part numbers just changed over the years but same part...thanks

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new owner of a 1975 dodge street van seeking wisdom from other slant 6 owners