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USA TODAY Sports

Rounds 1 through 4 will likely be the primary target positions in which the San Francisco 49ers look to add prospective talent in the upcoming 2015 NFL draft.

But the 49ers will boast nine picks this year—five of which will be in Round 5 or later, per Matt Maiocco of CSN Bay Area.

Barring trade-ups and other transactions, over half of San Francisco's 2015 draft class will be late-round selections. While not necessarily as heralded, these sleeper picks can often prove to be the proverbial diamonds in the rough.

Take last year's Round 5 selection of linebacker Aaron Lynch as a prime example.

So which late-round fliers might wind up being perfect fits for the 49ers in 2015 and beyond? There are usually some under-the-radar selections that could prove to be impact players at some point down the line.

Let's dive deeper into this possibility and examine five prospects that could have a positive impact for San Francisco.