I've never heard anyone say that they needed to replace the adapter. Personally, I would wait until I had the Lex AFM in hand and see if it is much different. You may find that you don't need to make any adjustments or that simply opening the bolt holes a little is all that is needed.
My preference would be either Apex'i or AEM... AEM will be less expensive and from everything I've read filters just as well if not a bit better.
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