Just out of curiosity, how do you know it is a problem with the LET pulleys and not a difference in the factory crank pulleys. The LET idler pulley used a lipped edge, the factory set up doesn't. I think you would be able to get away with a difference in factory crank pulley depths with only the the crank pulley and alternator pulley being lipped. When you went with the LET set up you now have the idler pulley with a lip, which won't be as for giving as the factory idler set up that had no lip. Reason I mention this is I replaced the steering shaft on my diesel because there was a TSB on the factory one. Well the new updated version once installed had the steering wheel sitting off center by 15-20*. obviously the second run of the new steering shafts were not to the same specs as the first run.