Rudy, if you dont have an answer to this by tomorrow, I will remove one from my elky and let you know. Just from memory, I can tell you they are coarse thread, #3 phillips head, and about 2 inches long.
I didn't pull mine, but did find them listed in the OPG catalog. P/N is PP0225 (arm rest base screw set)for a set of them. $4.95 Probably carried by many other suppliers as well. Hope that helps.
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