I have a 2006 TB145 which will need new rubber tracks. Tracks on machine are 400x72.5x72 ie. 72 links. Most vendors list 400x72.5x74 (74 links) as the correct size for the TB 145 and it is much easier to source and get a good deal on the 74 link tracks. I'm a total newbie to these machine but love the 145 btw, just wondering if I need to source 72 link tracks or would the 74 link ones work ok?