Hi guys. I recently purchased a 1993 skandic II 377R with only 13xxkm on it, but it seems to have leaned out the pto side and had a melt down. I'm trying to locate a used cylinder. One yard I talked to told me there's 3 different types. Anyone know the difference? I've located a couple complete 377's but now, until I see them and the numbers, I have no idea if they will work for me. Thanks.