Sorry I can't be more specific, but I think one of the retailers I called (fedhill probably) had a new product that they said might work in a situation like you have (which sounds exactly like my problem). That said, I think a bubble flare would suffice just fine. Just practice a bit on some scrap line and you should be fine.

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1992 300D 2.5T
1980 Euro 300D (sadly, sold)
1998 Jetta TDI, 132K "Rudy"
1974 Triumph TR6
1999 Saab 9-5 wagon (wife's)