Those protections only replace or protect the tank lobes. The original parts cost €35 to replace, and do protect well on impact, but a slide on the tarmac will get through them quickly.
Those protections have their own page.
Replacement bash plate.
Those only replace the original bash plate, and most also stop using the engine as a mounting point in the rear. Note that makes them incompatible with center stands.
An inmate at advrider, Ian Chappel, is doing a batch of very nice replacement bash plates, attaching to the center stand mounts.. No web site as of yet, but a PDF doc with all the info. £200 (plus VAT for Europe), shipping extra. See also a report of a satisfied user. Also covers the crap flap zone.
AS3 Performance plate
AS3 Performance list a 4mm aluminium bash plate on their web site (£180). Attaches to the same points as the original part. Note that it doesn’t covers the crap flap area. Watch this detailed install video about it.
Black Dog Cycle Works is building a solid replacement aluminium part in a range of finishes. $350. Covers everything, doesn’t attach to the engine but to the centerstand mounts.
Rade/Garage carbon plate
Rade/Garage went another way with a bottom plate in carbon/kevlar. Can attach to the same anchor points as the original plate or to a support (included) that connect to the pegs. Or both. Slick, and very competitive on price: €370.
Not a lot of details there, but Enduro Engineering, in the US, has a bash plate on its web site. Includes the crap flap, and it bolts to a solid mount point in the rear. $220.
B&B Offroad plate
B&B off-road also has a bash plate, that can be paired with crash bars. AU$345 without, AU$935 with. Apparently not using the engine attachement point, but still compatible with center stand. Waiting to see the design.
AltRider skid plate
Another replacement bash plate, replaces the original and avoid mounting on the engine in the rear.
Touratech reinforcement plate
Touratech takes a slightly different route and offers a reinforcement piece for the skidplate (Item # 372-5158). You install it against the back of the skidplate, so you won’t be able to see it when it’s on. This add a bit of robustness to the original plate.
Those do replace the original bash plate and have ears to protect the tank as well. Those are incompatible with all other underside protections and likely to make the installation of a center stand impossible.
AXP Racing spend a few months developing a bottom plate. It protects the bottom and replaces the side protections, and it is all plastic, AXP Racing specialty. Mounts to the original mounting points in the front and to a pair of aluminium brackets in the back bolted to the chassis. AXP Racing doesn’t sell directly, but through distributors, price may vary. Rotweiler Performance list it at $277.
SW_Motech makes a giant protection covering the whole bike bottom. All aluminium, 4mm thick. Looks robust, but bolts on the engine.
Bumot has one. €275. aluminium.
ACD is also offering a big case covering all the bike’s bottom. Available for €230 or £205 in the European store, but not listed yet on the US store.
The consensus seems to be that crash bars are unnecessary on this bike. The fuel tank protection are all the protection you need, they are intended to be a fuse and replaced once dinged. But this will not stop third party to make some, and some people installing them.
Touratech made a video with a lot of stuff visible on the bike (crashbars everywhere, luggage galore, headlight protection, hand guards). These are slowly starting to appear in their catalog (crash bars are €240 in your choice of color: metal/black/orange).
Hepto-Becker has crahs bar in black, orange or metallic finish.
Metal mule released crash bars that protect the tank lobes. £140.
There will be more.