These are the Motor Endbell Fan Posts Type I from Muchmore.

FEATURES: Enables Muchmore Cooling Fan to be installed on motor endbell
          For most brushed motors including Team Checkpoint, Yokomo, Atlas,
            Kawada and Reedy used in 1/10 scale applications
          Aluminum construction, blue in color

INCLUDES: Two Endbell Fan Posts
          Two 2.5mm x 14.75mm socket head screws

REQUIRES: Use with 25x25mm motor cooling fan, MMRC3041, MMRC3042

SPECS:    Length: 23mm (0.91")
          Length of thread: 6.75mm (0.27")
          Diameter: 5mm (0.20")

                                                                    cnh 7/30/08
                                                                         ir/jxs