GheckoAZ,
OK, I posted a source for the slide plate above but I'll go straight to the item:
{
http://www.shop.sew-classic.com/Bobb...e-SCP15147.htm }
It's a whopping $3.99.
As for the top tension it does need repair and possibly parts. I can't see from your pictures what is missing. The top tension is something your local sewing machine shop should have. It is VERY similar to the Singer 15s and might even be interchangeable.
Sew-Classic does have the thread check spring in stock as well. And there are other sources for parts on the web.
Now, about the motor. If I'm seeing correctly that is a BELGELCOR motor. That is an EXCELLENT motor. I bought an entire perfectly good machine just to rob the motor off of it for my HOTHER machine. I put the replacement motor from the HOTHER on the other one.
Don't let those who are Singer lovers ( not that being a Singer lover is a bad thing ) tell you that machine should be scrapped or parted out. You have more there than you know. Fix it and I'll bet you a 10 pack of Schmetz needles you'll enjoy using it.
Joe