marvin wroteI think the SPO had only one injector per cylinder.
Yes SPO has a small injector harness/connector to main harness- single injectors
SP5 look very similar, but w small dial harness / dual connector.
As far as i remember, 851 92 and SP4 has no small harness, but cables w single respectably dual connectors.
I think i have a 851 92 harness left over... should be no big deal to all the extra wires ..