Hi There,I have probably made about ten sets of lights for SA members and myself so I will try to explain how.
Take your old Corello and cut the back of the reflector off(pictures will illustrate) then break the glass and clean out all the original sealant,clean up the reflector and any rust then give it a coat of wattle rust converter and silver paint to finish.Note the special shape for the low beam cut out to make room for the parker light which you dont have to do on high beams or alfetta low beams.Buy yourself a set of the lights pictured(brand and part number is vital)2 of each,as these will actually friction fit into your old corello bases quite tight,you will need to remove the mounting brackets form the back,I do this by twisting the spotwelds until they break off. I prepare the old reflectors then get the new lights with the brackets removed and align them in a grill to make sure they are correctly aligned before squeezing them all the way into the reflector with pliers,if you think they are too tight you can stretch the old reflector a little by bending out the lip a little.I dont glue them or anything,just snap on the chrome or stainless trims over the lot and they are great.Just make sure your voltages are good and fit some of those fancy globes if you want!.If you look at my GT pics you will see the finished articles.