i have a "satellite ready" T1807 HU but i cannot find a sirius tuner that will connect the IP-BUS cable to the HU. i made the mistake of getting the SIR-PNR2 sirius tuner and of course, it doesn't fit. you would think that if this unit is "satellite ready" that someone would know which tuner to buy, but after calling sirius, directed electronics, pioneer, and toyota, noone seems to know. wtf?!! help please. surely i'm missing something...