I have my large Acerbis 15L clear tank for sale (bought in 2015 £330) which is in fantastic condition having only done one event (Baja GB 2015) and also a GZ multiswitch (bought in 2015 £165) which is boxed and brand new (never used).
The Acerbis tank is great, it fits with radiator braces and it's simple to fit. It doesn't add much to the profile of the bike and handling wise it plants the front end a little more and feels good. Baja GB was the first time I'd ridden with it and I finished 2nd overall.
It would definitely fit a 2012 KTM EXC 300 2-stroke, but would also fit other models - please confirm with Acerbis for fitting guidelines before buying.
The Acerbis tank is now listed on ebay here.
The GZ multiswitch is really nice to use, and it's got mounting holes for the standard KTM light switch on top - really useful. One switch to control your roadbook and ICO and your lights/horn/kill switch on top. I used one at Pikes Peak Navigation rally 2015 and it was brilliant (along with an ICO and F2R RB750 roadbook).
The GZ multiswitch is now listed on ebay here.
If you are interested, please get in touch and make me an offer via email at firstname.lastname@example.org.