The shark is a much closer fit however,
I have never fitted one in a Lola but have in another in-line scalextric car.
The NSR motor shaft extends from both ends of the motor
The shaft can be trimmed with a cutting disk in a dremel.
You will also need to find a suitable pinion.
I have never tried using a scalextric pinion on an NSR, this may be problematic as the NSR shaft isn't knurled.
Someone may advise on here on suitable glue/locking compound
If you use a brass pinion this may increase wear on the scalextric crown.
This may lead to investigation into a rear end swap (axle, crown, bearings hubs and tyres)
NSR and Slot.it make kits for this.
The last problem then is if the replacement pinion fits into space available
NB don't forget you will need to solder the leads from the guide to the motor