Since I build most of my aftermarket parts from scratch, I can't tell you how long to expect the wait from ModelBrass, but as it's been the Christmas Holiday season in the time since you've ordered and they might have been very busy, I'd reccommend patience.
You might try contacting them directly if it takes much longer. Most times I've ordered things internationally, I expect about 6-8 weeks for delivery. Not all of it is their fault as your own country's customs can often delay release of packages for a week or two. Small personal shipments aren't a high priority for them.