2. If you don't mind losing the anchoring strap that was stock on your 77[IIRC, that was your year] you can use pretty much any inline filter.
3. If this sounds good to you, try asking for an FJ60 filter. That should be a lot more common to find aftermarket, and they are generally translucent enough to be able to check for debris. Not as easy to see as clear glass, but not as heavy either.