Passenger side is easier than Driver's side. Our Outlook is 2007 but I can't imagine they changed between the 1st & 2nd year the vehicle was made...
For the passenger side around the inside track worked. It's around the bolt/leg connecting the track to the floor:
On the driver's side the outside seat track worked but it was very difficult. I wedged the tether between the plastic part (couldn't find a way to remove it) and the track to get it around the track. We never had a problem with the seat position but when I took the car into the shop they always put the seat all the way back and jammed it against the tether strap (and the seat if it was installed also). I think by that point DD was FF and I just left the tether there so if I moved DS's seat to that spot there was a tether there. (the white string is there to help show where I fed the tether).
ETA - for boosters (my kids are 7 and almost 9 now) DD had the PWSGL (using it backless now) and DS uses the Recaro Performance booster. The performance booster is a little tricky to buckle because it's so wide, DS figured out how to scoot it over when needed so he could buckle. For both of those I removed the headrest to get the boosters to sit flush against the back. The headrests are clipped in so it's a little tricky to remove and they don't click in if you need to put an adult back in the spot unless you put the clip back on (which I haven't done but I should for DD's seat since she's in a NBB now).
You might be able to fit the RF Blvd in the center with the Frontier on the Passenger side. I might have had that set up (or a FF MA in the center with the Frontier on the passenger side) for a while. Fitting 2 seats on the Pass/center is the tricky part if you want access to the 3rd row in the 8 passenger version. The Frontiers fit great in there, they also fit well with the headrests in the 3rd row (no tethers there though, I don't think the center 3rd row worked for the Frontier, but a FF Britax convertible fit well there). We even used the Frontier as a booster in the 3rd row, driver's side. It was easier to buckle there than it was in the 2nd row I think.