Just consulted Robert P. Martin. He has this on the topic:
William Bates - "On the Fear of God". 3:167-229
Thomas Boston - "Fear and Hope". 9:66-95
Thomas Boston - "The Happiness of Fearing Alway". 3:5-12
William Bridge - 2:422-31
John Bunyan - "A Treatise on the Fear of God". 1:437-91
Jeremiah Burroughs - "Gospel Fear"
John Flavel - "A Practical Treatise on Fear". 3:239-320
Matthew Henry - "Hope and Fear Balanced". 2:299-314
Thomas Manton - "Sermon on Malachi 3:17" 18:337-47