The ARRI BP-8 Base Plate Set for the RED Epic/Scralet is  a dedicated accessory for the camera giving it a multidue of mounting options and support optoins for the camera and for accessories.

The ARRI BP-8 Bridge Plate set is compatible with ALEXA Studio, ALEXA XT Studio, ALEXA M and ALEXA XT M head with ALEXA M Bridge Plate Adapter (AMB-1), ARRIFLEX 235, ARRIFLEX D-21, ARRIFLEX 435, Sony F23/35/65, SI-2K, Phantom, Weisscam HS-2, Mini Bridge Plate MBP-1 Pro BP, with adapter plate for EPIC/SCARLET. Through the use of the Bridge Plate Adapter BPA-1 (K2.72001.0) or BPA-2 (K2.66172.0) also compatible with ALEXA, ALEXA XT, ALEXA Plus, ALEXA Plus 4:3, ALEXA XT M and ALEXA M Body, accepts 19 mm support rods The adapter plate is also dedicated to the RED Epic/Scarlet camera bordies amd adapts to BP-8/9 or could be mounted directly on a tripod, and offers 15 mm LWS through K2.65264.0 - 15 mm LWS Rod Console

The kit includes

K2.65263.0 - Adapter Plate for Epic/Scarlet
K2.65264.0 - 15 mm LWS Rod Console (2x)
K2.66253.0 - Support Rods 240 mm (9.4"), Ø 15 mm (2 pairs)
K2.47090.0 - Bridge Plate BP-8 Set (19 mm Rods)