There are couple threads floating around regarding people attempting to fabricate this type of LBJ for eventual retail sale, but ultimately those threads ended up going nowhere.
The eBay ad says there is only 1 available, but the description says it's priced per pair and there's a $25 core fee. Not shabby for uniball LBJ's, but I'd want to see some welds and learn more about the testing details before installing these and doing freeway speeds with my family in the truck!
Here's the description from the ad:
Hello fellow toyota enthusiasts. If you know you know, the front lower ball joint is a weak point with the 3rd gen 4runners and tacomas. I have designed and produced in cooperation with FMD (fritchle mechanical design) a solid product to increase durability and overall functionality of the flawed oem counter part.
Im offering a core exchange. I prefer OEM toyota front lower ball joint/steering arm assemblies just for ease of manufacturing.
$25 core credit, buyer pays shipping.
Please note these will take time to make as i will need cores (stock ball joints) in order to start production. Price is for one set (one pair)
Not responsible for mis use of product or product failure property damage and or bodily damage and or harm, item is use at your own risk.