You should have no trouble replacing the sump...and gasket.
The only 'problem' area might be getting to the bolts where the
exhaust goes under the engine at the joint of the gearbox....
but I reckon there is enough space to get to the bolts.
New sump....2x part numbers for it.
A 6390100513 and A 6390100613
Gasket ...again 2x part numbers for 1 part ?
A 6390140322 and A 6390140422
Assume the higher numbered one supercedes the other....
If you decide to use a gasket 'sealant', choose a silicone type as it stays flexible.