+1, as stated by CH, I do not think Channel Master made a 1.5m dish. If the 1.5m size is important I think you may need to look at other makes?
If you are prepared to buy rather than swap you could look out for a second hand Gibertini 1.5m dish or if a 1.4m is large enough, a Primesat 1.4m dish. Both dishes are aluminium, the Gibertini is offset focus, the Primesat is prime focus.
Also, if you could find one, an Elite, IRTE or Precision 1.5m dish would be good. However, they are probably less common than Gibertini and Primesat on the second hand market but they are all high quality prime focus dishes.
Good luck in your search.