Or better still just order the correct part from Renault
While another 6 speed part might fit as mentioned - you'll be even more time down if it doesn't and presumably will then have to order a new one anyway.
Hard to believe you can't find the original one in your car. It's not exactly tiny is it !
Let me know if you manage to get the new one off without leaving the white collar behind still attached to the stick.
Same thing happened to me, but as the collar was left behind on the stick from the new knob - the spring won't fit over it!!
I could cut it off and buy a new gear knob, but at around £90ish they ain't cheap and mine was one of the original ones with the RenaultSport words which you can't get any more
Ah you lucked in then I was thinking about this though, I could put something like tiger seal in the gear knob and put it back over the collar/stick - leave it a day and then next time hopefully the collar should come off inside the gear knob!
All assuming I know where I put the spring of course, have you got the part number?