And you've looked under the hood itself (as in UP) and around the engine bay for Tbelt sticker? Ensure you do a FULL Tbelt service, not just the belt. The belt breaks, yes, but the pulleys and idlers fail just as often, the Water Pump less so. If you get motivated to replace the WP, might want to replace the Tstat as well - Subaru OEM only on that.
I believe the wagon and sedan suspension is the same height - only difference may be stiffer rear springs. But I'm sure someone out there has lowered one or the other, so google.
Tune up time? NGK plugs and wires (only). Pretty easy on the SOHC.
ATF - Do the drain, fill, drive repeat 3 times. That'll replace 95% of the old ATF. Also, the trans' external spin-on filter. It's meant for the 'life of the trans', but I'd replace it. Also, the front and rear diffs gear oil.
Coolant check? Going into the winter don't want that to be an issue. But if you're doing the WP above you can do it then. Remember to 'burp' the system.
Note that the front diff, oil, and transmission drain plugs and filler holes/tubes can get confused...they're not that close, but just a 'heads up'.
Upull It yards, CL and FB for part-outs for the other stuff.