Rear axle torx bolts

[Davmar1956]

I am new to owning Berlingo's and have just bought a 2005 muktispace with 83k on the clocck. Lots of small problems. The biggest being the rear axle is horribly corroded. Puechases a recon axle. My query to you experienced forum members is what size threads and bolt lengths for the y torx50 bolts holding axle to chassis. The bolts on mine are so crusty it may need gascutting on the 4 accesable bolts and prayer for the 2 up inside the mounting rubberany help apprwciated