Vacuum pump install issue
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You removed only half of the vacuum pump. Remove the front part of the pump too, and assemble the vacuum pump, then test fit the PS pump. IIRC, there's not enough room to mount them together. It's been some 15 years or so when I rebuilt my vac pump, so I can't remember exactly how it went. But I do recall that when I replaced the PS pump on a later date, there were some issues with it...