Hi guys. I have an '83 PW80 I am rebuilding for my son. The engine is shot. I thought it needed a top end when I bought it but upon further investigation found that the rod bearing on the crank end was seized. I got a crank from niche industries which came with bearings and seals but when I went to install the crank I found I had indeed ordered the wrong one. It is for later models and has a keyed shaft on the drive side rather than the splined shaft. What I'm wondering is if I can order the drive gear to match this crank and use it. Has anyone attempted this?