Source for yellow thread for contrast stitching?

My local upholstery shop is having a very hard time sourcing the yellow thread to do some work on my 360’s black interior. He’s been talking to Matt at ReOriginals and it’s been one month of Matt dealing with some guys in Italy that keep saying the ‘thread’s in the mail’ yet it repeatedly not showing up. I’m getting tired of waiting on them and was wondering if anyone knows of a supplier here in the states that I can get the thread from fast. I wouldn’t think this would be some rare item as it’s a fairly common thread used in many Ferrari models with black interiors.