Ah the old shudder when brakes applied. The carrier wear is easy to check. Does the brake disk move back to frt at all? If so the carrier is warn. You need over sized bobbins machined up, or new carriers. Do not just fit new bobbins because they will be the same as the old. (They don't wear much.)
If the disk moves from side to side,
http://www.moto-racing.co.uk/cat--Br...sc+Spares.html These guys have what you need. I have just done a set last month. Don't for get to glue the E Clips. You need new ones, as the old ones distort on removal. Any bearing shop should have them.