For anyone who may not know this on sears parts web site you type in your model number and it will give you parts diagrams which may come in handy when ordering a part or fixing somthing without a manual.
I tried that at the sears.com site, they had two diagrams, one for an external fuel tank and another for the pull cord recoil assy, don't bother with sears if you have model 217.58521 from 1970.