I own a sheetmetal business and can probably do them in mirror or grained finish for you
will see what tube i have tommorow i have to make a set for mine i can chamfer top edge on the lathe as well.
Just wondering but
I can make them a snug fit but what happens when you want to get them back out the hole.
I was thinking of putting a button head bolt drilled and tapped in the top and if they had to ever come out i could screw a grease nipple in and hydraulic them back out
will measure up tommorow if i get time.