Why is there what looks to be 2 different bottom ball joints listed?

There is what looks like a ball joint that has a plate under it with holes in for the bolts and there is what looks one that has tube across and a single hole.

sorry for my description but its a whilecsince i stripped the doner car. I am fabricating my own wixhbones and i know what top ball joint to use with the same taper (BMW). I'm just not sure on the bottom.

Paul

 

There is a long bolt/ nut that goes through the ball joint in the horizontal direction ...Then there is a vertical bolt from the top that threads directly into the ball joint

Be careful. Cheap no name ball joints may have incorrect thread pitch on the vertical bolt. I bought a cheap NB that the previous owner left that bolt out because the ball joint was replaced with a crappy one with the wrong pitch.

 

 

So what is the other one that I.....
ahem..poorly described? It's advertised on ebay as MX5 lower ball joint

 

Dealer or dont bother for lower ball joints on these cars, same with tie rods.

 

ok dealer is best got it

thats not what i was asking though

see these 2 links off ebay......

MAZDA MX5 1.6 1.8 04/1998-10/2005 LOWER BALL JOINT Front Off Side | eBay

and then these

FBJ5447 Ball Joint Front Axle,Left,Lower | eBay

if the second one i posted fits the taper then these are what i want to fit to my tubular wish bones on my MX5 engined classic mini.

Paul

 

The second one pictured is not a lower ball joint for a Miata. That's the difference. It looks like an upper for a '68-72 GM A-body car.