I have had a lot of help from this forum, time to give something back.
My '81 GTV tail light lens leaked because the seals were hard and cracked. No chance of buying replacements so after some digging I found 'D' EPDM seals from Clarke Rubber. Self adhesive, joined with super glue. Been in 6 months and have never leaked, all for about $15.
A cheap and great fix!
Great fix . You can still get the originals if you need then.( not cheap)
https://www.ebspares.co.uk/alfa75%20116%20Giulietta/electrical.cfm
Thanks mate I was just about to start looking for these!