Two Pack of Cross Blades a Spare Replacement Part for Magic Bullet Blender MB1001 Model Only, Juicer and Mixer

Will this work with rocket blender alado known as Bella blender?

This listing is incomplete, because the mb1001 series are not all alike, and the part for the 250w version does not fit my 200w mb1001a. which?

How can you tell which model MB you have?

When the blades jiggle and fluid starts to drip into the Magic Bullet base, can the blades be tightened?