Anyone know which HF injector socket would better suit my need to remove injectors on my 92 300D (2.5T)? I am going to need to dig in to do some diagnostics, and I see there are two types at HF that state they will fit Mercedes: PN 99878-1VGA is one, and 99884-3VGA is the other. Both are 22mm, but one is deeper than the other. If one is a better choice than the other, I'd like to know. I need to order their diesel compression tester, too.

Thanks!

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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)