Anyone running these?

http://vwparts.aircooled.net/Taylor-Spiro-...iro-pro-8mm.htm

They are not specific as to the fitment to a T4, but other than the boots being a possible problem in the way they fit the sheet metal, I would imagine t1 and t4 are pretty much the same.

Nope.
Length of two spark plug shaft bit is longer.
Boots are wrong.

Couldn't I just clip the ends of and put my old boots on? They have an aggressively threaded contact on the wire end, and just screw on, I believe.

Yup, you can, they twist off, no cutting