arb isn't all you need....
roll the arches for starters
Chassis notch (hole in chassis where driveshaft will hit it then welded up)
engine spacers - to raise sump, but mainly to correct driveshaft angle
remove arch liner.
probably shallow sump too
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WHAT?

you dont need do any of that, only if your looking to go mega low which he never asked anyway! if your thinking of going mega low and having the chassis nitce done then you might as well lose the front ARB anyway as you lose the drivability of your car
if you are planning to upgrade your ARB then you need
front mk1 audi TT ARB
adjustable droplinks
whiteline rear ARB
job done