WTD: 8 1/4 Suregrip at MATS

Just to be clear,, I am looking for the sure-grip unit only,

It needs to be suitable for use with 3:55 gears I already have.. I had been lead to understand the 2:?? suregrip will not work with 3:55, but please correct me if I'm wrong..

Thanx FABO ... grant