tire sizes for my 17s

[Andie1792]

okay i got these shipped in today they're pretty nicehttp://cgi.ebay.com/ebaymotors/17-Mercedes-wheels-rims-silver-C-CL-D-SD-E-S-SLK-amg_W0QQcmdZViewItemQQ_trkparmsZ72Q3a543Q7c66Q3a2Q 7c65Q3a12Q7c39Q3a1Q7c240Q3a1318QQ_trksidZp3911Q2ec 0Q2em14QQhashZitem220310718640QQitemZ220310718640Q QptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories[/URL]
now i just need to order new tires for them before putting it on to my 99 C280
I know the sizes to these are 225/45R17 but I was wondering if the rear tire sizes are different, I did a little research on it and some has rear tire sizing at 245/40R17 but the rear wheels are 17x8.5, what I order are 17x7.5 on all 4 wheels I think, so should I go with all 4 tire sizing at 225/45R17 ? or can i get 245/40R17 on my rear wheels ? thanks appreciate the help

Oh yea and also there seems to be something wrong with my its not really important so i didn't want to start a new thread about it, just bothers me a little... the actual mileage of the car is at 32,800
but instead of showing 32,800 its missing a couple of lines on the 3 and the 8 so it shows a backward L on the 3 instead and a F on the 8 lol so I want to know if anyone else ever had this problem and those anyone know how to fix it if they did, I check the fuse and they seem to be okay
thanks