There are several variation of SKS-D... Some are simply a modified SKS with the AK mag being retained by the usual SKS mag release, some have AK type mag releases but appears to be modified and refurbished SKS`s (with many parts pitted under the new finish) and some are newly manufactured SKS-D. There are various stocks as well: military, monte-carlo stock, tumbhole stock... Some have the bayonet lug, some dont...
The best are the new manufacture SKS-D with the military stock and AK mag release.
The SKS-D was designed with the US civilian market in mind but Clinton closed off the US to Chinese firearms and ammunition so the SKS-D only sold in Canada when US importers no longer could sell them in the USA.