last time I tried to find the combo pump all places told me it is no longer available so I just used a pump for a 289 mustang and routed my vacumm to the line that feed the pump ,works great most of the time some times I have to lift off the throttle a little for the wipers to speed up .I have thought of adding a vacumm storage tank just because ,but for now I`ll just keep it the way it is cause it is working just fine