If you can find second, get it in there and with the bolts barely snug use a soft faced hammer or hammer/ block or wood and tap the base all the way back and to the drivers side, then tighten up and see if it shifts through all gears. It should be close at that point and a little adjustment from there is all it should need. like if it's hanging up on the gate going into second from first just tap it a bit to the pass side and try again.
good luck