121 or switchback arms fit on assault?

[452ondoo]

Ive got a 2010 assault 146 that needs a lower a arm(no surprise there) So I ordered an rmk arm only to find that theyre different. So I got to looking around to see if a 121 iq or sb arm will fit. The part number is different, however the ski stance is listed as the same. Im just looking for something to pick up short term as Itll probably get some zbros arms. Any help wold be greatly appreciated.

 

[MNSLEDNECK56308]

http://minneapolis.craigslist.org/hnp/rvs/2182242385.html
not sure what side but this one might work!

 

[Alex C]

121 dragon are the same just has a sway bar mount. Don't know about the switchback.