I did purchase it through QMT, there are a lot of machines and products not listed on their website. The headstock from D1-4 mount to the spider is about 21-22" (22" to the edge of the cover). I f I recall the 1340GT was around 19" (to the spider bolts). On the ERL it is possible to have the spider bolts under/near the cover., it has a removable extension mounted to the spindle that is thicker and could be drilled for spider bolts.