3sge rear main seal?

[conechaser]

I am currently working on an 86 celica gts. I have changed the clutch flywheel and rear main seal only to have the rear main seal fail after a few days of driving. So I made sure to put a toyota seal in the second time. Guess what it failed too. The problem I am seeing with the seal is that the dust cover portion or "outer lip" fits entirely too tight making it not only difficult to install but it tears after a few days of driving. I have tried many different manufactures to see if I come up with something different but they all fit the same. Entirely too tight on the outer lip.
Has anybody else experienced this problem and if soo what do you recomecnd.
Thank you in advance