Sienna Seats -Recliners (Poll)

[scuba]

Where do you Ford guys mount your Sienna Recliners in the back of the van?* Specifically, what bolt holes do you use?

I installed one in the front passenger seat, and intend to put one in the "middle row," either behind the driver or behind the passenger, but since I'll likely make changes in the future (and am not an experienced modder), I'd like to minimize holes drilled through my new (to me) 2013 EB E350.

The stock E-series holes appear to be 11" 'long' by 5.5" 'wide' while the bottom of Ujoint Sienna mounts are 11" by 11" so to re-use two holes, you appear to be limited to being offest only laterally to the stock mount location, not fore / aft as in the attached picture (which I assume only re-used a single stock hole-- but could not confirm. MG's van has been re-configured.)

Or, does anyone know of a mounting plate that would interface between the 11x11 Unjoint mount to give me a 11x5.5 pattern to connect to two of the stock holes? (ideal location is behind driver, using only rear two stock holes)


*Note: I know that Expo Vans / MG Metal works is historically the source of wisdom on this, but he is out of the seat business and I don't want to further bother him.
**Note 2: despite the 39+ page posts on here and expedition portal, there's surprisingly little reference to the actual bolt holes.