Do a search for "end caps" and there are a lot out there. It is hard to tell from the pict. if you have the clearance for one. Looks like you would have to modify it where the weld is but a glob of silicone should solve that. Here is a co. that offers free samples:

caps

Tell them you are Bibleheimer Engineering and setting up production. There are a lot of caps in the hardware sect. of Lowes/Home Depot too.

1997 T-100 4X4 Xcab,Warn Hubs
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2008 Yaris