You only need 1 blueprint from the location in the materials listed here: https://inara.cz/galaxy-techbroker/
Thanks mate! That YT link was really helpful. Did this last night and got the booster in about two hours including travel time.
I thought it would be a grind but fortunately I breezed through it.
It's a must have module by the way.
I have grinded the engineers so hard for those extra lightyears.
In comes the guardian FSD booster....