TR3 Rear Oil Seal

["Musson, Carl" <musson@chekhov.arts.usf.edu>]

Planning ahead:  What is the consensus on the replacement rear oil seal for
the TR2/3/4 engine?  They run about $130  compared to $0 or $50 - see
comment below (not counting any sales or discounts).  Is it worth the extra
cost?  Is there much modification necessary?  

Engine is out of the car and will be going through a rebuild/refurbishment -
Rear seal is not currently leaking.


Thanks
Carl