Injector jerry-rig?

[VetteMed]

SO, I pulled the plenum and fuel rails off my 91 last night, and it seems that the injectors were replaced (PO said that they are Accels), but the primary and secondary injectors are exactly the same unit, but the installer left the lower o-ring off on the primary injectors (which have the o-ring in the injector housing). The primary injectors that seat into the ports with the built-in o-rings, are seated firmly in, but it just seemed odd to me. Are the Accels only available in one part number, like the later cars used? Is there any reason to not run this way?

Here's a pic:



Thanks!
Andrew