Some time back, I was repairing a Silvertone console and found that one of the IF primarys was open. I purchased a small 455 from
Antique Radio Supply and wired it inside the original much larger can. You need to do the alignment before putting on the larger,
original can while you still have access to the new IF. Since this is a can within a can, so to speak, the alignment is not affected
by the addition of the original can. The appearance is, in my case, original and it works fine. You may also be able to mount the
small can under the chassis if you have room and leave the large can in place.