How can I tell whether a bike fork is set up to take recessed allen nuts?

I recently had the fork on a vintage road bike switched out because it was damaged; the replacement was just a plain chrome steel road fork. I'm looking to mount a set of Tektro long-reach caliper brakes but they only come with recessed mounting bolts. So before I buy, how can I tell the difference between a fork that is drilled to accept recessed allen nuts versus one that only takes external hex nuts?

if it's drilled the top of the fork will have two tube thingy sticking out

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