For a 27 foot boat I would expect end fittings like this pic.
If you buy a pole ideally it will also come with a bridle
And a trip line that allows you to open the jaws at either end by pulling it.
Bridles are easy enough to make with dyneema
if you need to.
Oh yes. One end fitting will attach to a fitting on the mast
, the other to your spinnaker guy/sheet.
will go to the topping lift
(up haul) and typically the down haul (foreguy) (down thing) will go from the bow to the outer end of the pole. Or if you have a double bridle to the lower bridle.
Jaws UP so you can trip and lower the pole to disengage from the sheet. In light air the sheet will droop and be harder to disengage but in heavy air the sheet will stay up and the jaws up is the easy way. So jaws up for me.
Iíve done it both ways. The bigger the boat the more jaws up works well.