rhd blazers are **** about face to left hand ones go figure
and the radiator is just that radiator alone has a air con condenser to the front of that
then a steering cooling coil in front of that

the oil and trans are right in the middle low down at the front
with a flap door in the plastic skid plate to change the filter which lays horizontal

so if you hit some thing like a kangaroo, or a wombat, which are solid animals, and theres about 20 million kangaroos around the place, they would push the under plate up, and damage the oil filter fitting, or as has happened a bit of scrap from the water as its full of magnesium, and is called hard water, as these build up in the system, you can get as in my case a tiny flake under a O ring and the oil leaks, and not being a popular car here harder to get parts, I have managed to track down an O ring kit, will take about 3 or 4 weeks to get here so that's good and I will then work on the rest then

 

Our LHD Blazers have that access flap too to get to the oil-filter behind the undercarriage shield. But you also have our engine oil and transmission fluid coolers there too? Dang. Yes that would make them susceptible to damage from hitting a critter. About the equivalent here in North America would be a whitetail deer. But perhaps because their center of mass is above their skinny legs, when they get hit by a car, they tend to ruin the grill and radiator above the bumper.

Glad you found an o-ring kit. If you think of it, try to post a write-up. You are not the only RHD Blazer owner here and what you describe could help someone else.

Watch out for those kangaroos!