UPDATE TO INCLUDE JP STABILIZER SWEEP ARM.
Thanks for checking this out.
I am selling three J.A. Michell / Transcriptors Sweep Arms. Two of these have the "Stubby" type base, so the bases themselves won't be what you are looking for. However, as you probably already know, the threaded balancing pins are used for Fett's gauntlet darts, and the cone-shaped parts are used for Fett's toe spikes and for that one knee dart. The knurled end knobs are used elsewhere in the Star Wars prop world (perhaps on an HIC panel?), but I can't remember specifically.
Just added to this listing: third sweep arm - this is the correct JETPACK STABILIZER sweep arm base.
I am selling these three as a set.
USA (lower 48): $420 USD including Paypal Fees and USPS Priority Mail shipping.
Worldwide: $450 USD including Paypal Feels and USPS Priority Mail International shipping. If the actual shipping charge is less than $30 USD, I will refund the difference. If it is more than $30 USD, I will cover the difference.
If you wish to purchase these, please PM me as I will be notified by email that way. I also do not hold parts, so first to pay will be the new owner.
If you have any questions, please feel free to contact me.