Best way mate lol
Ive been out and looked at my rear beam bushes tonight as I have the same ones on mine. Ive got the seperate part on the bottom.....I thought to my self bugger me, Ive fitted them wrong! So I dropped the beam to move them over but, looking at the seperate part it has a recess that locates on the pressing on the mounting plates perfectly and they just didnt seem right fitting them on the top tbh. Think your best bet, phone the suppliers....and then update this thread for us lol