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I have mtd b120 (136L470E678) lawn tractor, and cannot find service manual, or proper parts diagram for it.

my main problem is with the deck lift spring (51 in the picture part number 732-0603) where is it connected in the rear?
i do not have number 78 (spring hook) or 12 (trans brake bracket?) if someone has a picture from the underside, that would be great
thanks

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Boy just don't see old mowers any more. The lady that one like this died about 9 yrs ago the family got rid of the mower.

If I remember correctly it connects to item 30.