'Joycoco 51 Pack Replacement Drawstrings for Sweatpants Hoodies with Drawstring Threaders and Plastic Cord Locks 47'' Long'

Do these stretch?

Can these be adjusted if they are too long?

The plastic cord locks are missing from my package, how do i contact the seller,???i would rather get them than return my package.???

there are two different lengths listed for this product! which is it?? 43 or 47 inches long?