Don't know why you want to know the depth, the centre bore diameter is 67.1mm, with a 5X108mm PCD.
They guys http://www.tttoolsltd.co.uk/ made some hub adapters for me to be able to use a Mercedes SL spacesaver wheel, and, they do spacers too.
You will need some longer bolts as well, these being 60 degree taper seat M14x1.5 bolts.
Being longer than your originals by whatever thickness spacer of course.