Hello Tony
I have replaced my prop with a gas filled prop as used in modern cars .
It attaches to the standard bracket under the boot lid , and extends down to the left hand step in the boot midway between the bracket that holds the tyre when stashed in its upright position and the tool curtain - works perfectly .
The gas prop guy measured the total weight of the boot and mounted wheel in the open position plus distance it had to travel , and chose the correct prop .
I like it better than the P6 factory prop arrangement , as its less fiddly to use and a nice movement . A one handed operation to close .
One option for you to consider .
Gerald