1957-1967 XLs had the solid bar cam cover. ¹⁾
1968-1970 had the finned looking cam cover.
You can interchange the covers if you are not concerned about the look of a stocker for your year bike (better resale trying to stay stock). Also be aware that some covers had the round cut out for the electric starter XLH that came out in 1967.
You can slap a cover on and wing it, BUT the proper way is to have the cover line reamed when the motor is apart.
(so the cam cover and the right case half are a match in tolerances.

52-78 cover had only one breather port at 6:00. ²⁾
79-85 had two. One at 6:00 and one at 10:00.
52-76 uses .625“ pinion bushing bore.
77-85 uses .562” pinion bushing bore.

1952-1956 Cam Cover - casting: 25202-52 3)	1957-1962 Cam Cover - casting: 25202-52A 4)	1963-1967 Cam Cover - casting: 25202-52A5)

1968-1970 Cam Cover - casting: 02-68 6)	1971-1976 Cam Cover - casting: 25202-71 7)	1977-1978 Cam Cover - casting 76-25202F 8)

1979-1980 Cam Cover - casting: 79-25202 9)	1981 Cam Cover - casting: 81-25223 10)	L1984-1985 Cam Cover - casting: 25222-84A 11) (no date code below casting)

Part number (25201-67). Casting number is (02-68). Top rear is cut out for the electric starter.

Click on a pic to enlarge: ¹²⁾

Part number (25200-70). Casting number (02-68). TOP REAR IS NOT CUT for electric start.

Click on a pic to enlarge: ¹³⁾