Phil,
It might not have been answered because the part comes complete and most people just grab the part and install it.
However, I did have to order one from Van's w/o the carb holes punched so I could drill holes for the smaller MA3 carb used on the O-290 and, as it turns out, for the O-235.
Take a look at my
engine page #1 and scroll down to issue #3. You will find a number of pictures of the OP26.
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html