Unfortunately, the part didn't pan out. It was a DE apron, but one had no kickback hole and the other had the hole on the wrong side. I suppose the one without a hole could be modified, but I'm going to try just using a chrome paint pen to touch up the Data East logo, which is the only reason I'd want to replace the apron anyway.
In other news, the return ramp arrived from Norway and I'm thrilled with it. Zero micro cracks around the rivets, and all the tongues and tabs are shiny new looking. The decal is also fully intact and vibrant. This now makes all 3 ramps in beautiful condition. That reminds me about a pro-tip: A poorly adjusted ramp divider arm will damage the return ramp over time. The two old return ramps I have (my original and the crappy one sent from Bulgaria) both have deep groove marks from repeated hits taken from the divider arm swinging open and smacking the plastic at the corner of the curved plate. The trick to prevent this is to reposition the linkage arm setting until the coil cannot pull the arm open wide enough to make contact with the plastic. I've been doing this as a practice since I got the machine, and naturally I made the same adjustment after putting the new ramp in.
So next up, I removed the current apron and serviced/cleaned all the coils and plungers for the kicker, returner, and launcher. I discovered the plastic striker ring was missing on the returner plate, and there was some rust in a few spots. The coil also had some slight heat damage, and the sleeve was permanently stuck inside it. I went on Marco and found they had every part listed in the entire assembly, so I ordered it all, including a new coil and new sleeves for the other apron coils as well.
Edit: Just ordered a brand new complete lockdown receiver and bar assembly from pinball life. On mine, the bar wasn't factory original, and the receiver plate was completely covered in rust (which I had sanded off). Now once I order the side armor from Marco, I'll be pretty much down to restoring the cabinet wood itself as the last job.
Below is a list of what I call "keep dreaming" parts I'd like to get NOS versions of:
1. Long plastic art piece that runs underneath the Nell table.
3. Hat Trick target decals.
5. Playfield board (not paying more than $300 for).
If I had the above, my machine would be in flawless showroom quality condition.