Aye, lesson learnt & all that. I recently purchased a small workhorse car £30 tax bracket(garage) for getting about town, lots of stop/starts as a care worker, anyway I think I'm quite savvy & among other things noticed no parcel shelf present in car. Was told no problem this would be rectified. Trusting old git that I am, I managed to iron out things apart from the shelf! Today four months later I paid the garage a visit again, I'm bending the salesmans ear, I also had a wee chat with lovely young lady at reception about my tale, hey presto she came up with a shelf, result.
Sorry, this is of no help to OP.