Welcome to lilHonda tomz50.
I guess you already know that the correct toggle switch for your K0 is a high dollar part. I don't think I've ever seen a replacement lever for them. I read once of someone who was a jeweler...or maybe had a jeweler make one. I don't remember what the material was that they used to make it out of. If you can get the remains out of yours, that would be a good start. Of course if you look around you can probably make a generic toggle switch work...a whole new switch I mean. Used and NOS are available, but again, expensive.
Maybe post a picture of your petcock. I think it should have a brass nipple that a plastic filter slides onto. The filters are available. Sometimes the original filter will get stuck in the tank, but still be OK...have you looked?
If you buy a new filter, you may need to drill it out a smidge to get it to fit on the early style petcock.
You can show us some pics of your bike too...we love those, and sometimes we can see something notable that might help you.