I would have thought you would get them in a Lancer - it isnt a small car is it? For a 2x10 the combo is very compact. They easily fit in my Pug 206.
Rough sizes (in cm)
R5 58 x 43 x 39(WxHxD).
R115 58 x 50 x 40 (WxHxD)
The R5 doesnt have the pre shape feature
I might consider trades but not the SB310 I'm afraid.