I'm sorry about being so late to reply to this. I haven't been in this section for awhile.
Here's the detail shots. I did check about the stand hitting the brake line and it "just touches" it, but no real force applied. If I'd made the pin for this bike I'd make it bit longer, but I had made it for my Bonneville and it worked, so I haven't made another. I did measure it and it's basically 27mm. The stem hole measures just under 28mm, might actually be 28mm exact if I could get my calipers lined up perfectly. But a 27mm pin would the one to look for.
There is a rubber plug in the stem that needs to be removed first.
Here's the view of the bottom of the stem where the stand pin goes in.
And here's the pin I made for my Venom stand. It came with a range of pins but of course most haven't been what I needed so I've made a few of them now for different bikes. I think maybe one of the original pins has fit some thing I've had.
Here's how it fits against the brake line. As mentioned, it does touch but there's no real pressure on it. If I'd made the pin about 5mm longer it would have plenty of clearance.
And a view from the backside showing how the pin fits into the stem.