Thanks for the input 🤙 what sites or what not will be my best option to choose from??
First you need to decide what direction you want to go.
Bench (you have it)
Buckets (aftermarket but look original)
Buckets (aftermarket or from a donor modern vehicle and don't care if they look original)
Once you decide that you can move ahead with options.
If you opt for factory buckets, you will need to find a set of seat cores-
local Craigslist is likely your best source as shipping 2 50lb seats gets expensive quick.
List your location on your profile here... maybe a member reading this right now has a set of seat cores that would work for you....
I would highly recommend trying to find the nicest and most complete set of seats you can, regardless of the model year covers that are on them, then change those out for 67 covers.
As others have mentioned 67s are a one year only seat with metal sides and backs and side release button... however 68s are closely matched, same side release button but has plastic sides and backs.... But if you don't care about the side release button than ANY strato bucket from 66-72 the covers will interchange and can be made to look like 67 chevelle seats.
Remember the covers hide the condition of the springs and frames, which after 50+ years can be in really bad shape (but they are not always) so get photos of the underside and if possible inside the seat back panels. if someone says they have redone the seats, see if they have photos of that process that show the springs and guts.
Decide if you are going to attempt to do the recover work yourself or if you are going to pay a shop. Recovering seats is not rocket science, if you tend to be a DIYer i would highly recommend you try it yourself. If its not your thing, then call around and find a shop that is comfortable with vinatge seats.
There are multiple manufacturers reproduction covers for chevelles. Prices are not all the same and the quality is not all the same- however for a 67 the cheapest ones (PUI) are actually pretty good. (that does not hold true for each model years design)
There are multiple manufacturers of seat buns for chevelles. Prices are not all the same and the quality is not all the same. The one you want is made in the USA by a company called "American Cushion Industries" or "ACI" these are quite a bit more $$ than the others, but they are much much better.
I would not recommend buying complete reproduction seats, price is one reason, and the 2nd is the selection of the parts within is left to the company assembling them and not you.
if you opt for aftermarket "stock appearing" seats... there is another thread going on right now (i'll try and find it and link it) discussing TMI Pro-Series aftermarket seats.
These are a modern reclining seat, that has stock-ish seat covers on them, so they will blend in perfectly with your factory back seat cover and door panels.
Another option in that same line is the Touring II seats sold by classic industries. These are procar Rally aftermarket seats, with custom covers by classic industries to look like factory covers for your model year and match the door panels & rear seat.
So there are LOTS of options.
Ask lots of specific questions here before you drop $$ ordering stuff.
There are many folks with lots of experience restoring interiors here that are happy to help, and try to help you avoid some of the mistakes that others have made!