Erik – see if any replacement chassis are available. I have had poor luck consistently finding them in stock. I think this upgrade chassis fits your Lancia model (SICA-08)
#Slot.it SICS08T-60B Lancia LC2-Chassis EVO6 for SICA08 & SICA21
https://www.professormotor.com/product-p/sics08t-60b.htm
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If not – there are at least 2 other ways you can set basic axle height. Once you have created a stable axle height you fine tune the tire height with guide spacers.
"... get on your bad motor scooter and ride!"
Sammy with Montrose