Now I know what I am looking at I can only suggest you ask, in view of seeing their own fitting instructions, to send the correct one + locking nut. I could bore it out for you if all else fails but I can only make a brass or steel end cap. Size and pitch of the thread needed as I would need to do a locknut to go with it.
In fact if you can do a set of pics and give dimensions particularly thread size and pitch ( you may need to send me a nut that fits if unsure ) and I will make one. Steel or brass as I have no Ally.
PM for address
Don
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