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.