I just put my Stern Star Trek: Vengeance Nacelle Mod up for sale at Pinball-Mods.com/oscom
http://pinball-mods.com/oscom/product_info.php?products_id=33
Prices may vary - but right now they are a whopping $2.35 w/ free domestic shipping.
More details here:
https://pinside.com/pinball/forum/topic/stern-star-trek-vengeance-nacelle-mod