Freelander 1 Thermostat Elbow Pipe Advice

Can anyone help, I just can't seem to get this into the hole, the O ring just doesn't go in ! Anyone any advice on an easy way to get this in?

Lubricate new 'O' rings with rubber grease ....

Yep, tried that ! Not getting close though ! Just seems too big for the hole in the block ?....

The procedure....
Lubricate new 'O' rings with rubber grease and
fit to sealing grooves in thermostat housing,
coolant elbow and coolant pipe.
Fit coolant pipe into thermostat housing, ensure
clip connectors are uppermost.
Position thermostat housing and coolant pipe
above cylinder block, engage coolant pipe in
cylinder block and press thermostat housing
firmly into position. Ensure mounting flange on
thermostat housing is aligned to bolt hole in
cylinder block.
Fit coolant elbow into cylinder block, press
firmly into place. Ensure mounting flange is
aligned correctly to thermostat housing flange.
Fit bolt to coolant elbow and thermostat
housing flanges. Tighten bolt to 18 Nm

Thanks Tony, the problem I'm having is the bit that says "fit coolant elbow into cylinder block, press firmly into place" !!!! It's too big !!!!

Did it come out or is it a new one? Can you stretch the o ring so it really gets into the groove, gives you a bigger internal dimension

It's a new Elbow pipe with new O ring... The O ring is on the pipe, it's just I can't get it into the hole in the block !!!!

Will have to get another O ring, as I've managed to shred this one trying to get it into the block !!! ARGH !!!

I think it is wrong parts .....measure old and new parts and see if differences