Freelander 1 TD4 fuel tank cradle

Hi
I have a 2005 Freelander 1TD4 with 3 problems I would like advice / comments on
1 : I have a badly corroded fuel tank cradle and had bought a used replacement, Can I lower the rear sub frame and "slide it in"
2 : I need to replace both rear half shaft oil seals, any advice
2 : I need to replace rear centre brake pipe due to corrosion any advice

Thanks