LMC is hit or miss with a lot of their quality. I've had good and bad luck, depending on the part. That can be said about a lot of vendors tho'. I was not impressed with their customer service, the one time I called them with a question. That was several years back tho', but I haven't bought anything else, either.
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a lot of old truck folks I know use Rockauto for a lot of things.
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If you have some actual part numbers, you can check the various online auction sites... and some of the parts store webpages if you can find the correct area.
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as always tho', shop around :
parts vendors list here at the 'bolt The Chevrolet & GMC Trucks Parts Vendors List by Woogeroo used parts searching tips good luck,
-W
