I have three sets of this more modern style pin including the bolt hardware. They clamp over the crossarm. I may be able to find a few more in the junk I have collected over the years. Pin threads are the lead style and snug up, so I wouldn't over tighten anything rare or power glass that's already cracked.
Also - the long bolts pull out of the top plate, so even if you didn't use the entire assembly - the top plate is easily mounted on it's own using other fasteners of your choosing.
They don't work for my outdoor display plans, but someone with medium porcelain or glass might like them for use outdoors. $5 per unit. ($15 for all three) Can deliver to the Garland TX show next month on May 15 or I "think" they will fit in a medium flat rate box when disassembled. Figure a total of $30 shipped for all three if using this box within the U.S.
* PENDING SALE - but I am checking for others to offer from my storage.