Rapidstrike Magwell Liner

This is a thing of necessity, I recently bought a 'spares or repair' Rapidstrike from eBay and noticed an issue prior to stripping it for repair/mod/rebulid.

The magazine doesn't locate particularly well and waggles around in the magwell, it sometimes fouls the pusher, which is goosed according to the seller.

A bit of digging has highlighted that there should be an internal magwell liner - and mine is missing.

A quick question in the Nerf Group turned me towards a couple of options, buy