For 1965 383 manual trans engine. Good luck with the sale!
Oh I'm sure it will work on other rides, but the original application is as I stated.Apparently fits more than that - here's one that has frozen secondaries.
https://www.ebay.com/itm/1965-65-Do...ash=item460b9af691:g:SboAAOxyuOtRZH7G&vxp=mtr