I found that my sat nav fits snuggly into the case designed for TomTom ONE V2 item number 190185816535 on the most poular auction site known to man.
My second purchase also designed for TOMTOM ONE V2 was a mounting designed to fit onto a dasboard air vent thus solving the windscreen ring mark problem item number 190186398503 also on the same auction site.
(Dear Rac Site moderator this message is posted as a suggestion to other sat nav owners & is not intended as acovert form of advertisng)