It's been some years since I worked their but last I did their ability to track stock of stores nationwide as you say was non-existant. At best you could see warehouse stock, but never have any clue as to when stock may arrive in-store. Finding stock in other stores was a matter of working the phone like crazy and inter-store transfers are more or less non-existant - the customer gets sent to the store to buy the item themselves.
Further, the RamFlo filters are a deleted line, and have been so for quite some time now so any stock left on clearance is probably gone.
I don't know if SuperCheap Auto still have an account with Lynx, but I'd hazard a guess that they still do and you should be able to order the correct filter just fine...
Seriously though, take your business to AutoPro or AutoBarn... you'll be a whole lot better looked after...

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