KZ750B3 twin front brakes

I have a 78 KZ750B3 that needs a front brake caliper bleeder bolt/nut. Just noticed mine has a regular bolt in it, not a bleeder. Are most of the brake parts for bikes and car pretty standard? Can I just pick one up at a local auto parts store? If yes, what size are the threads? Thanks guys.

I think they're 1/8" TPT, but don't quote me on that.
Although if the hole has a bolt in it, it may be FUBAR and require a new caliper.
The local auto parts store will probably have bleeder screws in stock, cheap, so buy a couple that look close and try them.