If either of the fittings have a basic flat pad as part of it that can sit flat on the roof (see the link in my previous post), it's just a matter of getting your ladder out, offer them up to the holes on the AFT, see where you can bolt them onto the roof, may need drilling? find/cut appropriate length bolts (not too long as the threaded inserts are "blind" ended, but long enough to get plenty of threads worth of grip) & bolt them on (suitable padding may need to be fabricated to protect the paintwork on the roof).
Where the threaded inserts come through the roof, check there are nuts tightly holding them on underneath, these have been known to work loose.
Don't exceed the weight limit on the roof (75kg?) & don't try & lift the roof with it fully loaded. Any long items, it's a good idea to lash the front end down to the front of the bongo (good time to have a bullbar fitted
).
You can't polish a turd - but you can roll it in glitter.
would be completely different ?? I also have a set of roof bars which i bought for my zafira....
So now what do i do - not being technically minded around cars, i have a feeling this is going to be beyond my capability....