The 2030 closer requires a minimum 1-3/8" top rail on the door for the standard track.
For a top rail less than 1-3/8" and as narrow as 1", you could use the low profile track and roller in lieu of the standard track and roller.
If ordering a complete closer - you would order the closer less track and X ST1737 (template for using low profile track and roller) and then order the low profile track (part # is 2030-SPL-3038) and roller (part # is 2030-SPL-3034) individually on separate line items.
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