For those having trouble with the top bolt, I tried the extension method and rust blaster but couldn't get it out so what I did was use attach allen socket to ratchet (no extensions) and was able to insert in with enough room for me to get on the engine and use my weight to push down on the ratchet, bolt broke loose.

I have a Disco series 1 so not sure how this would be for the 2 but this seem much easier for me than the extension method.

Anyone having problems may give this a shot.

 

top bolt is a breeze. Just reach in from the top. The bottom one on mine is locked up and real pain in the ***. Bolt extractor can’t even fit in such a tight space