74 Gibson SG - missing tremolo

[CT Slider]

So, I'm buying a '74 SG from a guy this weekend, going by the s/n, 174508, and the "Made in USA" stamp on the headstock it should actually be a '70 I believe? (Feel free to confirm on that one.) The deal is just about done and I'm after it for sure. I just need to hit up a bank, and seeing the nearest branch of my bank is 20 miles away and my car is wrecked, I'll be waiting til the weekend.

 

It appears to have have a Bigsby and I'm looking to find a stock or modern recreation of to match-up for it. It has that harmonica looking bridge on it still and some half-assed wannabe tailpiece on it. Basically, could someone confirm what kind of tremolo these SG's had and what direction to look for one of the parts? I know it's a lot to ask with a first post, etc, etc, but I could really use the help.

 

Thanks a ton in advance.

 

(PS - Think the user name is a good name for an 80's cover band bass player? Been trying to come up with something and figured I'd roll with it. )

[SolidGuitar]

I got an early 70s SG with a factory Trem. Here is a picture. I hope that helps.

 

[CT Slider]

Actually, that does a lot! Thanks for that. I'm pretty sure a Bigsby B5 will fit right on but I'll do some more research.

[CT Slider]

So, update: I bought it Friday night. I can't stop playing the thing!

 

I checked the pot codes in it. I checked yesterday, I think they were CTS made. I know they were made in '74. But I'm still confused by the Made in USA stamp. I thought that was only 1970? The serial doesn't help-it matches both years.

 

Pics! (Assistance please!)