You might try a search using the term "rear axle snubber".
You probably won't find anything specifically for your truck so look for something that fits- lots of different vehicles used the same style, especially Jeeps. Measure the mounting holes figure out the height you need. You may have to do a quick comparison measure on some different vehicles. Energy Suspension & Prothane have universal fit items, but they may not fit without modification.
For a starting point look at a '87-'01 Jeep Cherokee, I think the bolt spacing is correct & there are different heights. CJs & Wranglers used the same style but I can't confirm the bolt centers.
BTW please put the vehicle you are asking about in your signature- you say it's a "first gen", but a first gen what? I can tell it's a Trooper from the picture, but maybe not everyone can.

 

Thanks for the advice and yeah, I forgot to add vehicle details.. 87 trooper with the factory 10 bolt rear.

 

I had the same problem. There are lots of different ones made by Energy Suspension.

 

I have a 92 trooper, but I ended having to buy rear bump stops from energy suspension as well. I bought the universal. So, I would look into that. I did have to modify mine to fit though.

 

Will the bump stops from the Rodeo fit?
Those are still available through Honda dealers, I picked up a set of the cylindrical style stops for a 2000 Passport and they bolt right up to a 1997 Rodeo.

Edit:
Maybe these from a 99 Acura SLX will fit
http://www.hondapartsunlimited.com/acur ... ing-helper

 

I found some after market that look exactly same.....if you still need 'em PM and I'll figure out where I got 'em. I paid about $15 each

 

Finally got around to fixing my bump stop issue. With a little help from a member, I found a urethane version made for the heep XJ. Did a little grinding on the bolt holes and bolted them in!