Another thought I had would be to put a small "bead" of epoxy around the O.D. of the MAF flange, and let it fully cure before reinstalling the filter. This would give the clamp a "lip" that it couldn't slide over.
Mk3 |╠╬╝|SGM|203a|Moonroof|17" Paint/Mach Whls|K&N 57S-4000 -snorkel|FFE RMM|Steeda STB, RSB|JBR bushings
Mk1|╠╬╝|Pitch Blk|Prem pkg|Moonroof|SVT Snorkel|SVT Susp|Steeda STS|Z-Eng RMM|Magnaflow exh