Hello Tastisk,   Drive carriers are sold in a customer kit when you purchase a hard drive. To my knowledge we do not sell hard drive carriers individually.  You may ask sales about that when you order.   You may, also, ask sales if you can fill the empty slots with empty carriers instead of blanks. I don't know if this can be done.   You can find Sales contact here : [URL]  
We're about to purchase a T350 server to replace our old server. We will need to move the storage drives from the old server to the new T350. Does the T350 come with drive carriers or is it possible to order them along with the server? Been looking for answers and dell contact information, but haven't been able to find any. Thanks in advance Tastisk
T350 drive carriers