IF - the bolt is in place and the upper bushing/bearing/thing is OK -- and

IF - you can get a wrench (19 mm, maybe) under the spring seat -- and

IF - the replacement guide rod kit threads on cleanly to the old part -- and

IF - you can torque down the guide rod properly --

THEN - maybe you could get by with this being a temporary repair to eliminate the clunk and improve steering safety until it gets fixed completely.

Right now you can't align the car due to uncertain/inconsistent caster, the steering may be unpredictable, etc.

The age of the car and perhaps uncertain repair history probably means it needs some other front end work. It's not hard if you rent the right compressor and it re-establishes the safety of the car. If the LCA bushings weren't replaced, or now even if they were the missing guide rod kit may have contributed to their demise from a "wobbly" LCA.

You might get by with a temporary improvement, but long term I'd look at dropping the LCA, replacing the guide rod kit, the LCA bushing, maybe the brake support on the frame.