ABS glues exactly like pvc plumbing pipe. You can buy ABS adhesive at any plumbing supply or Home Depot etc. You should be able to call a local plastics company and buy some drop-off ABS from them, 1/16" would be adequate for this. anything thicker would probably be overkill and change you fit.
With a little luck you might be able to repair it with just the glue if you can get it inside the crack.
If you can't find anything locally. let me know and I'll send you some pieces. I am prototyping some kayak accessories from this right now in my shop and have some drop off but all I am sure I have is black. I'll be working some white 1/16 next week at latest.
Talk to your dealer also about a cracked part. ABS is really tough and I am surprised it has failed in that manner. We produce air splitters for race cars from it and have never had a failure.
You can get to me through my website at
www.dallascnc.com or just post back here. I am not in the forum as often as I used to be but I'll check back soon.
Good luck, Phill Pittman