Hi Hugo,

Dimensions taken from my build manual are :-

Draw a centre line down the gearbox and propshaft tunnel,then draw a parallel line 80mm to the o/s of this, (when you are sat in the"tub"). The centre of the dipstick hole is then 450mm forward of the centre of the gearlever hole.
Always remember though "measure twice, cut once" Also, have a good look to see if this is going to line up first before drilling and adjust if necessary
HTH
Mark.

Couple of late tips on this one.

Drill a pilot hole first, just large enough to look through and check you are in the right place.

Before you cut the hole arm your self with a suitable large grommet and then cut the hole to suit your grommet.

Alternatively, cut a suitable aluminium cover plate and screw it in place with some short self tapping screws. Good idea to back it with a rubber or foam seal.

Regards - Dave

Thank you Dave, sound advice.
I will go for the aluminium cover option.

Yours,
Hugo

Thanks to Dave's measurements, I have now found that the grommit was already in place.
However Dipstick is wel and truly seized.
Oh the joys of an old car that has been left outside for several years.