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The small pin is created at 4.44mm diameter x 57.08mm long & the 2 larger pins are created at 5.95mm diameter x 78.45mm long. The holes are created .5mm Diameter larger for a good fit at least on my printer. If you can match those with bolts or pins it should work. If you use bolts they will have to be a little longer to add the nuts. If you are familiar with openscad any, You could also adjust the diameter of the holes in the openscad source files to match the bolts or pins you need. I would suggest a simple test print of a cylinder with a hole the size you want to test before printing the large prints.