Twin... That was what I was looking for.Definitely a Legacy LNB it is either a Twin or a Quad it would be mounted on a dish 500 dish aimed at 110 & 119 satellites. A 311 should be the base receiver that will work but I would suggest looking into a 211 HD receiver for future proofing the receiver.
I think I'd probably look on eBay for a DPP Twin, I saw one on there just a minute ago for $26 with shipping included.