chassis is 50x100
this is the sill (im planning to replace the sills too

You will notice a few inaccuracies... its hard to get this right with a tape the top two measurements should be 57 and 24 (not 51 & 21)
the total width is ~85mm and height ~170mm

OD of the spring hanger is 39mm (cant help with the ID sorry) (Could have been 29 couldn't read the verniers properly)