How to Identify Fuel Injectors? - Viton vs Metal tipped

[SJ]

Patient is 1988 5000Q non turbo
Fuel injection system is the High Pressure type - System Pressure = 93 PSI

How do you identify viton tipped from metal tipped injectors?

I'm replacing my original fuel injectors, which have 165k miles on them and
18 years.
Bosch P/N 0 437 502 032
Audi P/N 035 133 551C

New Injectors are:
Bosch P/N 0 437 502 043
ETKA calls for 035 133 551F

The '032' has a deep well at the tip - distance between edge of cap and
center of tip. . 0.070" deep
The '043' has a shallow well at the tip .. only 0.020" deep

My parts guy had 3 injectors, and is looking for another 2 at same price of
first 3 ($27 ea).

Bentley says to use Viton tipped injectors as a set . . .and not to intermix
viton with metal tipped.
I want to be sure that the 2 injectors on order are same as first 3.

Question; Is the '043' injector the 'viton tipped' injector?

What the hell is viton anyway? Is this a plastic seat that the metal valve
rests against?

SJ
85 Dodge PU, D-250, 318, auto
85 Audi 4k - - sold but still on the road
88 Audi 5kq
90 Audi 100q




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