You can interchange some covers if you are not concerned about the look of a stocker for your year bike (better resale trying to stay stock). ¹⁾

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 (25200-57). Casting number is (25202-52A).

Click on a pic to enlarge: ¹²⁾

Part Number (25200-63 ). Casting number is (25202-52A).

Click on a pic to enlarge: ¹³⁾

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

Click on a pic to enlarge: ¹⁴⁾

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

Click on a pic to enlarge: ¹⁵⁾

Breather valves:
1979-E1982 production cam covers were installed with a reed type breather valve (26909-79).
In L1982, a new rubber umbrella type breather valve was used in production covers.
Breather valve kit (26909-79A) was then introduced to adapt 1979-E1982 covers with the new umbrella valve system.
So you may find used 1979-E1982 covers with the umbrella valves instead.
Click Here for more information on breather valves.

Part number (25229-81). Casting number (81-25223). Tach drive casting still there but the hole wasn't drilled for the drive unit.
Click on a pic to enlarge: ¹⁶⁾