arbor interchange?

[lumpy 0]

does anyone see a problem with this? my deck shell is shot, 1691812 42 inch. I picked up an older 990885 42 inch deck that is in exceptional shape, my original deck has the spline arbors and are in great shape no issues at all and mounted from the top side rather than the bottom , can I mount them on the older deck from the bottom side? by doing this the pulleys and the blades are at the right height if I mount them from the top the pulleys are at a higher height than the idler pulley and will not work and the blades sit in the shell too high. when I dry fit things and tightened them down everything seemed right. Am I asking for problems? really do not want to hassle with rebuilding the original arbors if I do not have to. thanks Mike

[rm 0]

how about shims. you can make up some for the arbors, blades just a thought