Modern Vespa

I bought Buchsenfuchs bushings from SIP

https://www.sip-scootershop.com/en/product/rubber-engine-mounting-bush-kit-shock-absorber-rear-12x38x20-mm-left-right-top-buchsenfuchs_30568110

Sadly the rear don't fit my SIP shocks as the inner diameter of the bushings is too small. OEM shocks have a 13mm shaft, the SIP shocks have 15mm. the Buchsenfuchs bushings are 12mm diameter and are too firm to stretch to 15. OEM bushings are 14mm (these are my stretched ones that i have been using on my sip shocks)

Haven't yet tried the front ones that I also bought ...

Don't you have a drill bit the right size?

hmm. not sure if I do. also don't have an easy way to do that as would really want a drill press which I don't have. I don't even have a shed/garage or a workbench or vice!

firstly I want SIP and/or Buchsenfuchs to admit that it won't fit (and hopefully update the description on their pages). but not sure about responsibility/refund though as I'm the one that picked it.

and also wanna see if the front fit. Buchsenfuchs sell two front sizes on their own site yet SIP only resells the larger so good chance it'll fit. (will check when changing front calipers and disk - shoold be soon).

then I'll consider hacking the rear ones but also ponder if fate is telling me that I'd be better off without them as might be too harsh on some of the roads I go on - it's all about balancing the sealed vs unsealed road experience.

Polyurethane bushes were great on my PX200 - made it run on rails. But I found them a bit hard on the GTS. Might try them again someday - they are sitting in a drawer in the shed, along with many other discarded mods.

You could use a file and file it down. It may take a bit of elbow grease and time but you could get it to the right dia. Don't need a vice etc, justhold it between your fingers and slowly work at it. If you get one of these kinds of files
https://www.harborfreight.com/8-inch-round-file-96628.html?utm_source=google&utm_medium=cpc&utm_campaign=12169518939&campaignid=12169518939&utm_content=114845790457&adsetid=114845790457&product=96628&store=403&gclid=CjwKCAjw3K2XBhAzEiwAmmgrAjPdSRrnsP7a7sc_c10TpNzKpCSdYvLGRaIajmWGc72qTYoPgqcw9hoCCPAQAvD_BwE
You could work it evenly and get to what ya need.

Thought of that - maybe maybe

How about applying some heat, to make them more pliable?

Heat will make them pliable and maybe force it through onto the shaft but it then wont be able to wiggle even a bit. There needs to be a small wee bit of play even if the majority of the movement is vertical some horizontal movement is good to have I would think.