I lucked into that exact dish last year. It's a beauty.

But there is a caution. The aluminum struts and nuts tend to oxidize together, meaning that if you take off the original scalar plate, shearing off (breaking) the strut is a very real possiblity.

I saw what people went through on that and determined to leave the scalar in place and to drill out the hole as it sat. I measured the lnb with a caliper and bought a decent hole saw of the same size. I then drilled a hole with it through a piece of 1/4 inch plexiglass and then c-clamped that plexiglass on the scalar dead center on the existing hole. The plexiglass acted as a guide to hold the hole saw dead center.

The scalar is aluminum, so drilling it out took about 15 minutes with a lot of oil. No broken struts, good to go.