In general, bimini's and towers dont get along well. Most factory boat bimini's mount wide and go straight up, they will normally not fit under a tower. Tower biminis curve to the center to match the tower design, and each tower company provides custom bimini's to fit their tower.
Nearly all of us tower slingers third party our Bimini's to people that specialize in that. The big problem is they are made to the customers size and color specs, so they can not be returned if they dont work. I'd advise against using a non-factory bimini because these products can not be returned as they are made to order for the customer.
I'd recommend the factory tower bimini that was made for the 2000 X-5. I know it's likely more money (as OEM product generally are) but you sure dont want to spend $4-500 on something that does not work.