Your top track is no longer being made, unfortunately, so we suggest changing it to our 23-520. This part is actually 29-3/4" wide, not 30", but that should be okay as the company that made it suggests some play on each end of the track. You can always cut down the 3' long 23-509 track with a hack saw to match the precise size of the old track if you wanted.
The top pivot pin that's compatible with this track would be the 23-112 and the top guide pin would be 23-114. If you need a new bottom corner bracket, you can use the 23-301 and the adjusting pin will be 23-113.
