Lewis
Your tripod is the older (pre 2011) model and on the bottom of your GPD2 (2012model) is a 45mm>60mm adapter so you can get the SXD or SXW to fit by removing the adapter from the GP and using it on the SX, just 1 grub screw holding it on.
Can't help you with Aust Post though, I sent a registered letter which arrived in 2 days, but the delivery notification return slip was not signed for another 6 weeks, go figure.
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