Combat Robot Wheel Hub

Fits a 2" foam wheel for my antweight robot, inner diameter of the foam wheel is 15mm.
Uses 2 x #4 3/8" screws and a wheel collar for 3mm motor shafts.
https://www.amazon.com/Hobbypark-Landing-Stopper-Airplane-Replacement/dp/B01EA912P8/ref=sr_1_1_sspa?keywords=rc+airplane+wheel+collar&qid=1548032657&sr=8-1-spons&psc=1