i've found 70mm 90degree silicone bends on ebay for less than £13.50 posted in red, blue, black.
and sorry, as burt said you only need the 90 bend as you use the off-cut, its me thinking about the vectra one that i've done 3 or 4 of and they need both bends.
so burts £30 & £13-£13.50 for the bend and its all done matey!