Looks like it might be a very early unit without the holes for the rack ears, like the one I have. I emailed the guy who posted the ad and he said there were no threaded holes on the side, just a handle. http://cgi.ebay.com/Simmons-SDSV-SDS5-SDS-5-Analog-Drum-Synth-No-Reserve_W0QQitemZ270711574974QQcategoryZ38069QQcmdZViewItemQQ_trksidZp5197.m7QQ_trkparmsZalgo%3DLVI%26itu%3DUCI%26otn%3D3%26po%3DLVI%26ps%3D63%26clkid%3D7460690758466725944#ht_562wt_1099
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SDSV Brain +2 modules on Ebay
2011-03-02 by Reek