Change how a variable displays when executed within a custom module

I have the following code for a custom button within a new custom module I'm building:

record_name = cm_returns.get("record_name");
cf_dealer = cm_returns.get("cf_dealer");
cf_item = cm_returns.get("cf_item");
cf_item_2 = cm_returns.get("cf_item_2");
cf_issue = cm_returns.get("cf_issue");
cf_replaced = cm_returns.get("cf_replaced");

sendmail
[
from :zoho.adminuserid
to :"<email>"
subject :"RA Item Received"
message :"The items for " + record_name + " have been received. Details:Dealer: " + cf_dealer + " Items: " + cf_item + " " + cf_item_2 + " Description: " + cf_issue + " Replaced already? " + cf_replaced
]
resultMap = Map();
resultMap.put("code",0);
// 0 - Success ; Other than 0 will consider as failure
return resultMap;

It produces all the information in the email, but the cf_dealer and cf_item pull from Zoho Inventory Customers and Items, respectively. In the executed information in the email, it displays the ID number Zoho assigns a customer or item when you create it, rather than the name of the customer or name of the item (which is what displays in the record itself).

I'm very new to this and trying to figure out basics on my own, so my question is there any way in the code to have that variable display the actual customer or item name the way the record does or is it a weird quirk that Deluge pulls the ID number itself only?

Hope this makes sense!

Here is an example output, so you can see the ID numbers, rather than names:

The items for RA-002 have been received.
Details:
Dealer: 2841805000000274258
Items: 2841805000000145619
Description: Warranty replacement, SO-01391
Replaced already? Yes

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