[dansluck]

Werner, The advantage of a bronze bearing seal is that it has a thrust shoulder. If the thrust on the rear main is broken or cracked the aluminum seal can be replaced with the bronze seal and help prevent crank forward movement. The bronze is stronger than the type 11 babbitt I use. When doing a complete babbitt job I use them to take the stress of the other 3 thrust shoulders. I have successfully used them as a partial fix when a club member wants to keep his car on the road. Dan