Hi Clint, Sorry to hear about your loosing a mast. That can ruin your day! It happened to me two years ago when an overzealous friend driving my car and towing the M15 out of the water after retrieving the boat, decided he was going to take boat and me on the deck, around the corner to his marina where I could lower the mast at leisure. The only problem was a big oak tree branch across the road; and if we had made it to the street - power lines! Maybe the oak branch was a blessing in disguise! Anyway, I too got a new mast from Dyer in North Branford and rebuilt my mast. First thing you need is a Pop Rivet tool for fastening the various cleats and eyes to the mast. To answer your direct question, here are the measurements I took off my original mast and transferred to the new one: ALL DIMENSIONS ARE MEASURED FROM THE BOTTOM OF THE MAST. Sail slide feed opening: from 32" to 38" Down haul jam cleat: (STBD) 17" to centerline of cleat Stainless Steel eye (P) 19" to center line of eye P / STBD (2) 3 1/2" cleats - see your current configuration Holes through bottom of mast: 1" up from bottom: 5/16" hole for bolt in mast base fitting Hole through mast: 172.5" - 1/4" hole for bolt that holds shrouds and forestay Fairleads Stainless Steel eye (P) at 42" center - main halyard Front side of mast: 166" center - eye with block - for jib halyard Forestay hole: front side of mast: 168.5" to 169.5" by 3/8" wide (chamfer the edges) Boom stop: rivet in track groove - 20" from bottom of mast. With your old mast as a pattern and these dimensions, you should now be able to rebuilt it. Good luck. Connie M15 #400 LEPPO