Footstrap inserts ??? (In UK)

[Floyd]

Looking for footstrap inserts to move footstraps on an old board. Gun used to supply a "christmas tree" type plastic insert that could be epoxied in place; which I`ve used in past.(And lasted years)
They have stopped supplying them. (They now sell a gadget that I think simply will not work for retro fit but ???)(Its rectangular for a start and has no "root")

Has anyone used the insert supplied by Gun or does anyone know where I can get the older type from ???

Thanks