cat R2

i am looking at a r2 narrow track. It runs good and drives and steers good. It has electric start a front mounted hyd pump and a blade and pto. the sheet metal is all there and good and the tracks are pretty good.I couldnt find the sn number the exaust manifold is homemade does anyone make new ones? also the front seal on the trans is leaking how hard is it to fix? Also what would be a fair price for it I am not sure because I dont have any experience with the r2. deos parts from the D2 fit it?
thanks for the help Mat

i have a r2 but most of the guys know more about cats than me but i think most of the undercarage of a d2 is the same but the rest is not i think you can match cat 22 for other parts good luck.