not AFAIK they usually answer the phone after a while, they get very busy as a lot of people use them instead of local fiat dealer part shops, because thier better
as for gasket, you mean hot side turbohousing TO downpipe gasket? like a big metallicy rubber doughnut?
try ordering a ford one for a rs turbo fiesta (which ever mk it is) as they use the same model of turbo, but I couldn't say for the actual size.
failing that, erm, turbo rebuilders, they may have one in a box, or a part worn one taken off a car, or know someone that can make one.
and if NONE of th above works out, theres always JB weld

or just weld the bugger solid