Shift arm is bent different to accommodate a different seat. Look at the 3-4 shift fork it could be bent and not putting the gear all the way in to place. You can use the shift lever from the old cover in the new one I think. I think you can use the shift fork as well if the one you have is damaged. Call Novak for tech information if needed. This is the link: http://www.novak-adapt.com/knowledge/sm420.htm
But as I said I think the parts will interchange with out issues.


Steve H