might as well do the rear main and freeze plugs(with some rtv orange around them...blue gets too hard) but yea they are trying to screw your or someone got confused. the bellhousing/pump/case gasket deal is made into the bellhousing(i think, either that or the case) and u have to get machining done to replace it, but most the time that isnt the problem. and for your front seal to go back im betting your flywheel is cracked, your starter teeth are showing wear, and the spacer lip is cracked. the bellhousing rarely leaks
now would be a good time to buy the upgraded t/c(i used a 91 4.0 low stall when i had my a4ld) with the longer snout, and the sonnax spacer like geasemonkey said. the old style t/c's and spacer only has the lip of the spacer on the converter snout, which means the snout is only about 1/8" in there. they are cast iron too and always crack around the lip. the sonnax has a raised lip and is billet so u wont have to worry about it again
now if your spacer isnt cracked and the seal went out...i dunno that means something isnt alligned right. but take it apart, post pics and we will help u and u can go from there