On the 2019 Sprinter Van I am finding various sizes of bolt heads using the “E-Torx” style.  I found them in the rear bench seating lock down tracks.  Also they hold down the from seats to the seat pedestal.   Since I ordered a seat swivel bracket.   I thought it was time to invest in a set of sockets in this style.  I am sure these will show up in other locations.

Some local auto parts stores carry them.  They are also available on Amazon for under $20 for an 11 piece set.