Well I was trying to bleed my brakes by myself and purchased the motive power blleder with rectangular top. Unfortunately the 7/8 bore wilwood m/c is larger than the adapter. has anyone run in to this? Trying to think of a way to modify the adapter and keep a good seal

You could make your own adapter out of plate steel or aluminum, (even plywood) and a sheet of rubber. A couple of male air tool fittings, a "Y" adapter and some clear tubing.