Risers on some co's models were to clear the wiper motor, others had a drop bracket for the wiper motor, some co (don't know who - mine) had neither, and others had snaps attached directly to the windshield (earliest model).
I will make a tuneau type dealie some day. I have a tilt down stre. wheel. Will lock it down so nothing will be above the doors, bed rails etc. Pull out the window frames. It will B like a boat cover. Will snap over a folded down windshield on the hood and continue over the bed & tail gate. It will go down the sides about to 'er cute lill' belt line. A zipper will be placed in the driver's area with a curved path so as to be able to get in, snap the ster wheel up n drive away. Almost like the spray skirt on my kayak (not as tight). There will B 2 bows (made from strapin) 1 @ the bulk head area and 1 1/2 way between there and the tail gait. Don't wanna hassle with other tops (damn that wagon top is heavy for an ol' fella like me). Tired w/my foolish messin with the other 3 tops. That way I can move the seat back (to stretch out my legs so as to not feel like I'm sittin @ the kitchen table) with out reconstructin the 1/2 cab n bulkhead. I go slo enuff to not hafta pull the whole thing off due to the rushin winds flappin it all around.