Triple Track Replacement Parts (Very old!)

No need to tell me - these triple tracks are OLD! I hope you have something that will help me out. Winter is almost here!
Photos are of 'corner latches' on the storm window. (One Left & One Right) They are metal. They are stamped 7003. The 'corners' on all of the frames are slid into the slot, and then the aluminum frame is 'peened' to keep them in place! The 'joining tabs' for the mating frame rail, in the photos, are broken off, so I tried to place them, in the photos, as close as I could get them.) I'll probably be needing at least 8 of these, (4 Left & 4 Right) IF you can identify them!
I'm also looking for 'internal corners' and 'internal tilt corners' for the screens, (for these same triple tracks) but I didn't see any on your web site. All of the frames (screens & windows) have mitered corners.
These frames are 1/4" thick aluminum. I'm guessing, from the age of the house, that these triple tracks are probably from the early to mid 1960's.
I hope you can help me out!
Thanks,
Dave

Thanks Paul for all of your help! I was surprised to get a response from you, as quickly as I did! (Talk to the powers that be about a raise!) If these parts fit, I'll have to put you on my Christmas list. There's no one in the Chicago area that could help me out. You came to the rescue! You guys rock! Thanks again! Dave