Adam,
Yup! Film caps of higher values are BIG ! ! Consider the size of a 1uF film cap. You bought 100uF. But they sound very, very good!
I'm a confessed capacitor junkie. I have a pair of big oilers, see the post 2 above me, in my FP 2 Pseudo Dual Mono Power Supply set up. Those are bypassed with KK (Kommie Kap) PIO and KK Teflon caps. Ok, I'm a strange man but my wife loves me.
You could attach the caps to the sides of the base and use stranded wire to attach them to the circuit. Stranded is much more flexible and will withstand repeated flexing without breaking.