Hi mate, unfortunatly i dont know much about t-18's in general, however i do have a later model t-18 in my sprinter, it has sway bar mounts stock if that gives u an idea of what it came out of.
More to the point, i had a whiteline adjustable panhard rod on my stock sprinter diff, and this fit perfectly onto the t18 diff. Truenosedan can get them for $120ish to ur door, or try whiteline again. But i definitly had one for a sprinter and it fits perfectly on the t18, so i dont see why this wouldnt suit ur car also.