I found this guideline out of all places, at one of the flash banner of JPJ homepage and not under information related to technical data but for the record here it is. I was surprised to note that the measurement between alphabets/numbers for the front and rear plates are different i.e. 5mm and 10mm respectively and this also goes for the border spacing to the edge. I am sure many people are going to be trapped by this technicality. There is also no information as to whether alphabets/numbers need to be embossed as before so I guess this means stickers are OK then.