Authentic OEM Replacement Rivian Factory Body Bolt (TP55 head) for R1T and R1S.  These bolts connect the Rivian body to the Rivian frame.  This is a brand new original bolt from Rivian.  Bolts are in stock and available for immediate shipment. 

Note - Rivian has also used a T55 bolt in their service channels.  Chance are you're Rivian came with TP55 bolts.  The T55 bit is slightly different than TP55, but the bolts are interchangeable (note - different socket driver is used for TP55 and T55)