DiscountPirate

As part of my 1990 Silvia build I'm hooking it up with all manner of jdm goodness like full accessories, parking pole, and license plates. I've done some research and gotten some help from Japanese guys but the last part I can not figure out is the connection between the registration sticker on window and the license plate.
So far what I have figured out is that the kanji characters and numbers on plate designate the prefecture and municipality, and also engine size. There is an additional sealing bolt used on left bolt of rear plate that has a kanji character on it matching the issuing municipality for the plate. In addition to this there is a registration sticker that is placed on windshield that I assume matches the info from the license plate, in most cases it is a red square with a number and 5 or 6 kanji characters under it. Does anybody know details regarding japanese registration stickers and if and how they connect to the license plate?
I have a nice jiko-shiki hirame and the matching Tokyo sealing bolt, these are:
多 磨 56
ろ 61-48
Unfortunately I am unable to transcribe what is on the registration sticker because I haven't found the matching kanji.