Can someone tell me what these are?

Call your chromer before you do any welding, usually they just want to fill the holes and do repairs themselves. i truthfully dont know if thats due to a special process, or if customers dont do the repairs clean enough to chrome over, but I have heard it several times. Guess it makes sense it has to be perfect, since you cant just use filler to get it straight as you would with body work.

what Johnny said!