Hi guys,  
I owned a LA7200 and currently researching ways to have diopter rig on it.  
I found the easy solution here; http://www.stronzvanderploeg.net/anamorphic-shooting-with-the-la7200-part-3/#comment-112  
Which is buying 86mm diopters ($19) ; http://www.ebay.com/itm/310829145416  
And then use a step down ring of 105mm to 86mm, that the 105mm sits perfectly at the LA7200.  
But the problem is; that it's impossible to find that step down.  
My question is would the step up 86mm-105mm ($7) work? http://www.ebay.com/itm/151037727008  
I've asked the seller of the Vivitar Series 1 diopters and they said the diopters do have Front threads on them, thus I can just screw them on the step-up rings.  
Guys, you think it'll work? Or is there any better solution/budget that guys can recommend me to get my LA7200 to work properly?  
Thanks in advance...