Wait, so you got your W60 without any tips and ordered a separate set of one specific size? Or did you order orange tips because you didn't know W60 will arrive with all the sizes already? These tips do last a long time, not easy to destroy them Plus, sometime you can go back'n'forth between two "adjacent" sizes to slightly fine tune the signature. I use orange ones as well for a better seal, but if bass is a bit overwhelming (like in W50), I can step down to red. Maybe it makes sense to get another full set from your local distributor? These sets are usually relatively cheap.
Another trick, as you're aware Westone shells have a thin nozzle which can't accept large bore opening eartips. So, for example, you can take unused tips, cut off the stem part, and use it as a nozzle spacers with other eartips over it.
They came with the full so-called 'True fit/Star fit' set - except the red Star Tips - but I like to have spares & know that with iems it's typically only the largest size that works for me... but not in this instance it would seem.
I've had both the Shure 535 (and more recently the Nuforce HEM 8) so have already made sets of spacers for use with wide-bore tips - although the benefit of doing so isn't so apparent to me with the W60 as it was with those models - esp the HEM 8. I'm really impressed with the Westone tips.