it sounds like you're wondering if the handles on your truck are GM made or aftermarket - if they're the correct handles for your year what would be different? if the handles need rechroming, then they're not NOS obviously - if they look like they could take a good chrome job, it's up to you if it's worth it!
OEM and NOS are usually the same thing - NOS doesn't mean the part is repro or from an 'aftermarket' supplier, only that it's a brand new part from way back then that was never used - much/most NOS is by the OE maker, which is why it's preferable to reproduction
Bill
