PTO side depends on whether it's an auto or manual oiler drive case for the XL-12/SXL Series according to one of the compilation lists I have (and according to a Remington PL-4 rebuild I just did with the manual oiler drive case that took 6119's on both sides).
-PTO Side Seal for saws with the auto oiler drivecase with the fill up by the
handlebar bracket: 58308B.(07021). Aftermarket? The next one someone discovers will be the first. I've seen references and discussions about a Dichtomatik match, but never a real world confirmation of one.
-PTO Side Seal for saws with the manual oiler drivecase and the oil fill down below
the muffler: 12282A. SKF 6119 double lip. SKF 6120 single lip. National 253747.
Poulan 530019097
-F/W Seal:12282A (OLD # 58688A). SKF 6119 double lip. SKF 6120 single lip. National
253747. Poulan530019097.