Just seen this on Ebay Uk
https://www.ebay.com/itm/New-6-Speed-Gearbox-Humber-Scepter-Hillman-Hunter-Jensen-Healey-Sunbeam-Alpine/283224640422?_trkparms=aid%3D333200%26algo%3DCOMP.MBE%26ao%3D1%26asc%3D20171011185446%26meid%3D34dec71674f64188ae00732af4b8f9bd%26pid%3D100168%26rk%3D1%26rkt%3D12%26sd%3D302922302688%26itm%3D283224640422&_trksid=p5411.c100168.m2941
I have no affiliation or knowledge