Hi Both -
No those wont work with the Fox Specialist - the diameter is too narrow for the spars - for some weird reason the ones you need are a spare for the Ultra Brolly range but aren't listed adjacent to the Specialist brolly on the website - its all pretty confusing but the reality is you'll need two of these -
Product Ref - CUM219-17 Storm Pole Attachment + Holder (x2)
View attachment 18645
These fit the spar diameter and have a retaining clip to stop the threaded section sliding back up the spar arm (theres no pressure / screw fit connection etc). They really are a doddle to fit - straighten the spar arm with your hand and pop out of the brolly end pocket - slide on the attachments (the correct way round) and then pop the spar arm back in - takes 30 seconds and no tools - solid.
The website is additionally confusing as they are £12.96ea 'as a set of two items/SKUs' (not £6.96) - that's £25.92 plus post (!!!!) so best to email and order via Fox direct to save disappointment -
eurocustomerservices@foxint.com