I found this advertisement on an Austrian site. It is not me who offers the part but I can help if you need translation etc. !
https://www.willhaben.at/iad/kaufen-und-verkaufen/d/jaguar-e-type-getriebe-3-8-fhc-dhc-s1-gearbox-boite-de-vitesse-330941384?searchAgentQueryString=searchId%3D301%26alertId%3D21647416%26lastSearchInMilliseconds%3D1567708218461&objectId=330941384&xtor=EPR-320-%5BSuchagent%5D
