JJS
Guest
The 1859 will fit. The elec. vari speed reel should also work, as most 510"s had that on them.It is just a two way switch . If it has elec. height then it is a later model 1859. Massey made a conversion kit for the older 700 series, and the 510s. We installed one on our 750 for $480 for the kit, quite a few years back. Came with a sheet that showed how to hook up to various MF combines, the 510 being one of them. It's possible that you could piece one together form a salvage yard. Check with your dealer, he might still have some of the old information. Joe