Rheostat Retaining ring

[ProtoTipo]

Hello
am I missing something ?
The link to this http://www.ebay.co.uk/itm/FIAT-124-S...vip=true&rt=nc
show the reostat and not the ring ?????

Concerning the blak plastic ring we did At SEC a quick manufacturing batch and a "group by" some year ago

Hi Michel,
I said "for one of these".
Maybe I should have said "to fit one of these"?