911 S ers and E ers. . .

My "Japan Equipment" '73 E has identical mirror placment on both sides which is further back than normal. Could someone check the Workshop Manuals Volume 8 Sections 10.3 1/1-1/6 and see what it says about locating dual mirrors. All help would be appreciated. Thanks and here is an image (I see no welded holes under the large rubber plug which normally covers the mirror studs and nuts)
-Allen-