Standard shop-vac filter won't fit!

[Daveed]

Have RIDGID filter sizes changed?

The reason I'm asking is that the standard replacement filter (VF4000) I bought at Home Depot yesterday doesn't appear to fit my 5-year-old shop vac (WD 0800 0), a 3.25 HP, 8-gallon model.

It's a shade to tall for the motor assembly; I can't get the plastic threads to protrude through the cap so i can screw on the plastic bolt.

I'm I doing something wrong?

Thanks

[wbrooks]

I think I have read that they changed but the sears craftsman ones still fit.