Tow bracket - longer studs?

In the attempt to mount the Warn Winch behind the front bumper , it looks like I need to space the front bumper out just a bit more. So, I need some longer studs - maybe 1" longer, and can trim if/as needed. Local Auto Zone - has next size larger diameter, which I suppose I can drill everything out to fit, but wasn't really wanting to get away from stock/original diameter if possible. Does anyone know where/what else I can use????

I bought some grade 8 standard bolts for mine. Don;t remember what size but they have been in there for a couple years. Take the hook to home depot (or wherever you shop) and match them. Have since added a winch and they have held up well with pulling and winching.

I'm trying to use the stock bumper cover - for now, so, I don't have access to the bolt head to hold it. Suppose I can tack weld the head. ½" bolt fits fairly good, and I have Grade 8 here at work - ¼" to ½" in Gr.8 up to 3" length in most all sizes. Just seeing if I have any other suggested choices.

Well, I made a sleeve to adapt the 12mm I think it was to ½". Bolts fit tight in the bracket now....
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Then welded this 3/16 rod to the bolt heads so won't turn...
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That ought to do it......

Studly!

Nice job