Check this, i got one off Base direct to see how hard it would be to mount my turbo on a F7r/f7p look what i found...
http://i13.photobucket.com/albums/a2...4/DSC00194.jpg
http://i13.photobucket.com/albums/a2...4/DSC00195.jpg
http://i13.photobucket.com/albums/a2...4/DSC00196.jpg
spot on.... just holes are a tad out...
wat ya recon... can you weld Cast steel/iron