Looking to trade a 2nd generation Sirius unit for a 1st one + I'll toss in some cash. The units have no functional difference except the 1st gen units work a bit better if you use an iPod slaved off the Sirius unit.
Here's a list of all the Sirius modules for reference. You can easily tell the 1st gen units because they have two connections for the antenna.
84110141981 1st generation requires Y antenna adapter (84110392102) for units without OEM Navigation
84110153365 1st generation requires Y antenna adapter (84110392102) for units with OEM Navigation
65120398140 2nd generation
65120416377 3rd generation sold only with 1 year subscription