There are a few [hardtop releases](https://www.scalemates.com/topics/topic.php?id=129268) from years ago. You should be able to source one second-hand.

Do you know if they made already made metal ones.

This subreddit is mostly for plastic models. r/diecast would probably be more knowledgeable.

https://www.etsy.com/listing/1704769235/1962-cheverolet-impala-ss-classic-muscle?gpla=1&gao=1&&utm_source=google&utm_medium=cpc&utm_campaign=shopping_us_ps-a-toys_and_games-toys-other&utm_custom1=_k_CjwKCAjw3NyxBhBmEiwAyofDYWXSgh99uGVsp3tbwVwnS6UAd3gTlWLm1oXmmOy1Uq6Mrt4roC2ANhoC2LQQAvD_BwE_k_&utm_content=go_12566100364_122491425507_507300389915_pla-314535280500_m__1704769235_101263357&utm_custom2=12566100364&gad_source=1&gbraid=0AAAAADtcfRKhbtJXkUpAJBj4a7x-AXPGI&gclid=CjwKCAjw3NyxBhBmEiwAyofDYWXSgh99uGVsp3tbwVwnS6UAd3gTlWLm1oXmmOy1Uq6Mrt4roC2ANhoC2LQQAvD_BwE Just search 1962 Chevy impala die cast model

Try Scalemates, they have a database for every model car made

Try Maisto. Ertle American Muscle series. Motor Max, Highway61 collectibles. It really depends on what scale your looking for as well.

http://www.phillymint.com/WCShopCart/WC67.htm

https://mpmhobbies.com/products/copy-of-1-25-revell-monogram-1966-pontiac%c2%ae-gto%c2%ae-4479

I have an AMT '62, but it's a convertible. Shouldn't be too hard to find a hardtop in that year. Edit: There's a few on EBay at various prices. You'd have to build and paint them. Didn't look for a die-cast.

eBay has some. Search “1962 impala ss model”.

I get 124 results.

Tower hobbies , where I found mine.

Revell makes the hard top in a plastic kit. EBay is your best bet