P-Clips my best option?

mattt1974
mattt1974 Posts: 8
edited December 2015 in Commuting general
I've bought a Topeak Super Tourist DX Rack to fit on my mountain bike but unfortunately I've now discovered the frame lacks the required holes.

IMG_20151226_125848_zpslsaatcwq.jpg

Are P-Clips going to be my best option?
What are those big holes in the frame? Perhaps there is something that will fit in those?

Kind regards,

Matt

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