What is the part number for the proper Service Manual to add the supplement to?
I keep finding info on service manuals for touring models but it doesnt list that it includes Street Glide.
The main shop manuals are broken out by families, not specific models. Therefore, the Street Glide is in the Touring family, and you will need the Touring shop manual, part number 99483-10 for the 2010 models. This book covers Electra Glides, Road Glides, Road Kings, and Street Glides (which is a subset of the Electra Glide).
Main Shop Manual - 99483-10
FLHXSE Supplement - 99600-10
Touring Electrical Diagnostic Manual - 99497-10
FLHXSE Parts Manual - 99433-10
If you want to find the main manual part numbers, you need to just go the the Touring section of the web catalog and click on manuals; if you do a search by year and FLHXSE, it doesn't list the main manual for some reason.
http://www.harley-davidson.com/gma/gma_product.jsp?PRODUCT%3C%3Eprd_id=845524446434321&FOLDER%3C%3Efolder_id=2534374306698001&ASSORTMENT%3C%3East_id=2534374306698001&bmUID=1277646457334&bmLocale=en_USJerry