recomendation for a 75v-->12v buck converter?

hi all,
I stepped up my voltage from 48v to 66-75v and need a good buck(step down) converter to get the voltage down to useable levels-12ish volts.

All the pre-made modules I can find top out at 60v, anyone know a good one that can handle higher input voltages?

If you read around, you'll find plenty of examples of people (like me) using AC adapters (wallwarts) for this.

There are lots of high voltage and current DC-DC converters on eBay and AliExpress.
http://www.ebay.com/sch/i.html?_from=R40&_trksid=p2050601.m570.l1313.TR0.TRC0.H0.X72v+to+12v.TRS0&_nkw=72v+to+12v&_sacat=0
http://www.aliexpress.com/store/product/E-bike-DC-DC-Converter-24V-36V-48V-60V-72VDC-universal-to-12VDC-10A-72V-Electric/313864_522806594.html
http://www.aliexpress.com/item/DC-DC-VOLTAGE-REDUCER-CONVERTER-FROM-96V-84V-72V-60V-45V-120V-TO-12V-240W-20Amax/32626469145.html?spm=2114.30010308.3.11.EOAuFj&ws_ab_test=searchweb201556_8,searchweb201602_4_10017_10021_507_10022_10020_10009_10008_10018_10019,searchweb201603_9&btsid=e960448e-554b-4483-8a09-150696a0bdd7

That would be perfect. Searched wall wart buck and got the answers I needed. And I have dozens of spares at work. Thanks a bunch!