Fuel lid spring xk 150 late

Hi all,
Is there one who knows what spare nummber the spring of the fuel lid itselfs, so not of the dome, has. And the more : who suplies it ?
Mine is broken and repair with a diy spring was until know unsuccesfull.
Thanks for your help, Roger

There are two springs, One is for the hinge Number BD 4366
the other is under the rubber boot cap BD 4396 These are for late model. for cars with Chassis number 827194 onwards
and 837628 onwards Coupes,
820001 and 831140onwards.
You may want to try McMaster -Carr web page. Good luck.