Meade barlow lenses

Does anyone know what the difference is between the #124 and 126 barlow lenses. I ordered a package deal from Discovery Channel Stores that came with the #124 and also ordered the #126 because that is what is recommended for the Meade ETXEC. I got the package deal beacause of the 18mm superwide angle eyepiece primarily, but also because it had the #124 barlow and a 5mm eyepiece.
Thanks for any information on this topic.

I believe the #126 is the shorty barlow. It isn't any different optically than the #124. It is just designed to be shorter to match the small size of the ETX... it's purely asthetics.

The #140 barlow is the high end triplet barlow.