Will these Wheels Fit and be close to flush on my MKIII
 

PATTERN:5X4.50 or 5X114.3
WHEEL SIZE:19X8.5J
OFFSET:30
or
OFFSET: 43

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they are the right bolt pattern, the size tho i'm not too sure about.. you should check out www.tirerack.com. there you can find out how big and what offset will fit on your car.. i don't think that 19s are too big tho.

i run a tire shop so i speak from experience id run away from anything 19"s they are way too expensive because they arent common enough and if your in a jam and need a tire you likely wont find one in stock possible could end up on back order

Just my thoughts on the matter: I agree I wouldn't run higher than 18's and I wouldn't want those on anything which sees a lot of use. I've got 17's and they're comfortable enough, but downtown I sure do feel the crap roads. I've worked on a MKIII with the same springs as my car (different dampers though, similar rates though AFAIK) and that ride was rough.