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The MacGregor sailboat (M26M) was produced with two different type of masts.
Look down into the feed slot channel to note if it has a triangle shape (built between 2003 to 2007) or the rounded shape, provided from 2007 till today.
This MastGate is for the triangular shape with a Track Depth of 19.8mm (TD taken from non-bent track area) and the vertical spread of 170mm ( 6.7" ) spread slot.
If your length or TD is different, contact Tom Luque at info@MastGates.com to receive a worksheet of measurements.
Do not trim the end tips of insert for fitting. Questions to Tom Luque info@MastGates.com
2-year warranty/ for build version 5/31/19 v.100.5
Because of spread-open slots are custom hand-made, your slot length may vary in length & width. You may require a different MastGate to be built.
Send an aft photo of mast with a ruler taped next to the slot. From a distance of 12". to info@MastGates.com
You will need to supply a set-screw (6-32 x 3/16" and one allen hex key.