Brambles, if I remember correctly, Cross Canada Panels gets all their stock from Sherman Industries. Most of them are Taiwan made parts, but they fit as good / bad as most of the others available.
Do you have any photos of the quarter panel that needs replacing? Generally, I suggest that you replace only as much metal as is necessary, rather than replacing complete panels, especially quarters. The smaller wheel well arch and rear lower patch panels seem to be easier to replace than doing the compete quarters. Again, only use as much of the patch panels as you require to get to good metal on your exiating quarter.
If you do decide to use Cross Canada panels, shop around with several suppliers and you can probably save some cash because of their pricing syatems.