The "SL" monicker are only found on imported Sony cans. The D22's come with a 13" cord attached plus an option of adding a 38" extension if you aren't or don't want to use a remote.
With the remote attached, the short cord makes sense, as you don't have a lot of tangled mess to contend with or give you greif. The beauty of the SL design is that you have a choice of either using the remote or connecting straight into the unit.
There are a few select Sony cans that have this set-up - namely, the D22's, D66's, EX70's, and the E888's. The 888's, actually, don't have an extension - they're simply known as the SP-version. In North America, the EX70's and 888's have the standard LP cord, which is about a metre in length.
BTW, you can only get the Eggos as imports, since Sony does not make them as a domestic headphone.