Since I'm just along for the ride  -

what is the issue ? the post at the center of the Bussard shouldn't be there ?

what is " PL " ?

Can't you get a receipt for the Enterprise kit from where you purchased it ?   -- With it you can get free parts ? replacement parts ? or ?  ,, very confused .

A different fan kit will fit the Bussard you have or you get a 3D-print Bussard that will work with the PE fan you have ?