Hi, I have a Ber-vac snowblower attachment for my Wheelhorse tractor, Ber-vac model W0246D and I'm having problems finding a simple part for it. It's a cap that has falling off and got lost, now it leaks fluid from the front differetial and my best attempts at fixing it have failed. I contacted the dealer that sold it to me, we have found the part number in a parts book but can't find the part. Any help would be appreciated. Thanks