Hello Robert. FWIW I recall seeing the following post some while ago about generic brands of the sealed for life ball joints being discussed here - if you’re going this route I suggest you read the following post to the end regarding quality - no surprise but apparently not all parts are created equal! 
It seems Lemförder is the recommended brand (as David mentions above) rather than some cheaper aftermarket options out there. Just something to be aware of - good luck with your project. 