IIRC, Spinergy doesn't make skewers. As for Co-Motion, they shipped our '04 Speedster with Salsa sets. I use the same skewer set for both the original Velocity Dyads and the Spinergy T2 rims. But both sets of rims are 700s. (I really should invest in another set.) Oddly enough, Salsa doesn't mention tandem skewers on their site. (Or not that I found, anyway.)
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Jeff
Learn from other people's mistakes. You won't live long enough to make them all yourself.
2004 Co-Motion Speedster
2010 (Specialized) Carmel comfort (my neighborhood bike)
2008 Raleigh comfort (wife's neighborhood bike)